HTML Introduction
What HTML is, what a web page is made of, and your first complete HTML page that you…
4 min read
Tutorials
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The language for building web pages. Start here if you are new to web development.
HTML Editors
Write HTML on your own computer: create your first .html file in Notepad or TextEdit, then set up…
4 min read
HTML Basic Structure
The outline every HTML page shares: doctype, html, head, title, meta tags and body, what each one does…
4 min read
HTML Elements
How HTML elements work: opening and closing tags, content, nesting elements correctly, empty elements like br and img,…
5 min read
HTML Attributes
Attributes give elements extra information: href for links, src and alt for images, lang, title, id and class,…
4 min read
HTML Headings
The six heading levels from h1 to h6, how to build a clear outline with them, and why…
4 min read
HTML Paragraphs
How the p element works, why browsers ignore your extra spaces, and when to use line breaks, horizontal…
4 min read
HTML Text Formatting
Bold, italic, highlighted, small, deleted, inserted, subscript and superscript text, and the difference between strong and b, em…
5 min read
HTML Links
Create links with the a element: absolute and relative URLs, opening links in a new tab safely, linking…
4 min read
HTML Images
Add images with the img element, write useful alt text, set width and height, choose the right file…
4 min read
HTML Lists
Unordered, ordered and description lists, nested lists, numbering options and why navigation menus are built from lists.
5 min read
HTML Tables
Build tables with table, tr, th and td; add headers, captions and sections; merge cells with colspan and…
5 min read
HTML Div and Span
Block and inline elements explained, and how the generic div and span containers group content for styling and…
4 min read
HTML Classes and IDs
Name elements with the class and id attributes, use them from CSS and JavaScript, and learn the naming…
4 min read
HTML Forms
How forms collect information: the form element, action and method, labels, text inputs, the name attribute and submit…
5 min read
HTML Form Inputs
Every common input type, from email, number and date to checkboxes, radio buttons and dropdowns, plus built-in validation…
6 min read
HTML Semantic Elements
Describe the parts of a page with header, nav, main, article, section, aside and footer, and see why…
5 min read
HTML Media (Audio and Video)
Play sound and video with the audio and video elements, offer several file formats, add captions, and embed…
4 min read
HTML Accessibility Basics
Make pages everyone can use: who relies on accessibility, keyboard access, alt text, labels, contrast, headings, landmarks and…
5 min read
HTML Project: Build a Personal Profile Page
Put the whole HTML course into practice by building a complete, accessible personal profile page step by step,…
7 min read
The language for styling web pages: colours, layouts, Flexbox, Grid and responsive design.
CSS Introduction
What CSS is, how a CSS rule is built from a selector and declarations, and why separating style…
3 min read
How to Add CSS
The three ways to add CSS (inline styles, internal style elements and external stylesheets), when to use each…
4 min read
CSS Selectors
Element, class, id, group, descendant, child, attribute and pseudo-class selectors, plus specificity, the rule that decides which style…
5 min read
CSS Colors
Colour names, hex codes, rgb, hsl and transparency, how to pick a small colour palette, and how to…
4 min read
CSS Backgrounds
Background colours, images, repeat, position, size, cover and contain, gradients and the background shorthand, with a hero banner…
4 min read
CSS Borders
Border width, style and colour, single sides, the border shorthand, rounded corners with border-radius, circles, outlines and box…
4 min read
CSS Margin and Padding
The difference between padding (space inside) and margin (space outside), the one-to-four value shorthand, centring with auto, and…
4 min read
CSS Box Model
Every element is a box of content, padding, border and margin. Learn how its size is calculated, why…
4 min read
CSS Width and Height
Set sizes with px, %, rem, vw and vh, use max-width and min-height for flexible layouts, and control…
4 min read
CSS Text and Fonts
Font families and fallbacks, web fonts, size, weight and line height, alignment, decoration, transform and spacing, plus rules…
4 min read
CSS Display
How the display property controls layout: block, inline, inline-block, none, flex and grid, plus hiding elements correctly with…
4 min read
CSS Position
Static, relative, absolute, fixed and sticky positioning explained with badges, overlays, sticky headers and back-to-top buttons, plus z-index…
4 min read
CSS Flexbox Basics
Lay out items in a row or column with Flexbox: flex containers, direction, justify-content, align-items, gap and wrapping,…
6 min read
CSS Flexbox Layouts
Control flex items with flex-grow, flex-shrink, flex-basis and the flex shorthand, then build a sidebar layout, equal cards,…
5 min read
CSS Grid Basics
Build two-dimensional layouts with CSS Grid: grid containers, columns and rows, the fr unit, repeat(), gap, and placing…
5 min read
CSS Grid Layouts
Build full page layouts with grid-template-areas, make responsive card grids with auto-fit and minmax(), and combine Grid with…
5 min read
CSS Responsive Design and Media Queries
Make pages work on every screen: the viewport meta tag, mobile-first CSS, media queries and breakpoints, fluid type…
5 min read
CSS Transitions and Transforms
Animate changes smoothly with transition, move, scale and rotate elements with transform, choose easing, and add simple keyframe…
4 min read
CSS Variables
Store colours, spacing and fonts in custom properties, use var() with fallbacks, build a dark mode, and organise…
4 min read
CSS Project: Style Your Profile Page
Turn the plain HTML profile page into a modern, responsive design with variables, Flexbox, Grid, cards, a dark…
5 min read
The language that makes web pages interactive, from your first variable to working with the DOM.
JavaScript Introduction
What JavaScript is, what it can do in the browser and beyond, how it relates to HTML and…
4 min read
Where to Put JavaScript
Add JavaScript with script elements and external .js files, understand why placement matters, and load scripts correctly with…
4 min read
JavaScript Output (console.log)
Show results with console.log and its relatives, write into the page with textContent, use alert sparingly, and debug…
4 min read
JavaScript Variables (let and const)
Store values in variables with let and const, learn naming rules, when to use each keyword, and why…
4 min read
JavaScript Data Types
Strings, numbers, booleans, undefined, null, objects and arrays; checking types with typeof; and how JavaScript converts between types.
4 min read
JavaScript Operators
Arithmetic, assignment, comparison and logical operators, why to use === instead of ==, the ternary operator, and nullish…
4 min read
JavaScript Strings
Create and combine strings, read characters, and use the essential string methods to search, slice, change case, trim,…
4 min read
JavaScript Numbers
Work with numbers: rounding, fixed decimals, converting from strings, NaN checks, the Math object, random numbers and formatting…
4 min read
JavaScript If/Else
Make decisions with if, else if and else, combine conditions, use truthy checks, write guard clauses and avoid…
4 min read
JavaScript Switch
Choose between many exact values with switch, understand break and fall-through, use default, and know when an object…
3 min read
JavaScript Loops (for, while)
Repeat code with for, while, do...while, for...of and for...in loops, control them with break and continue, and avoid…
4 min read
JavaScript Arrays
Store ordered lists in arrays: create them, read and change items by index, add and remove with push,…
4 min read
JavaScript Array Methods
Transform and search data with forEach, map, filter, find, some, every and reduce, and chain them together to…
5 min read
JavaScript Objects
Group related data with objects: create them, read and update properties with dot and bracket notation, loop over…
4 min read
JavaScript Functions
Write reusable code with functions: declarations, parameters and arguments, return values, default and rest parameters, and functions as…
4 min read
JavaScript Arrow Functions
Write short functions with the arrow syntax, learn implicit returns and returning objects, and understand how arrow functions…
4 min read
JavaScript Scope
Global, function and block scope explained, why let and const beat var, how shadowing works, and a first…
4 min read
DOM: Selecting Elements
What the DOM is, and how to find elements with getElementById, querySelector and querySelectorAll, loop over results, and…
5 min read
DOM: Changing Content
Change text, HTML, attributes, classes and styles, create and insert new elements, remove elements, and render a list…
5 min read
JavaScript Events
Respond to clicks, typing and keys with addEventListener, use the event object, prevent default actions, and handle many…
5 min read
JavaScript Forms and Validation
Read form values, handle submit, validate input with clear error messages, combine HTML validation with JavaScript, and use…
6 min read
JavaScript Local Storage
Save data in the browser with localStorage and sessionStorage, store objects with JSON, handle errors, and remember a…
5 min read
JavaScript Fetch and JSON
Load data from APIs with fetch, understand JSON and HTTP status codes, handle errors, send data with POST,…
5 min read
JavaScript Async/Await
Understand asynchronous JavaScript, Promises and the event loop, then write clear async code with async/await, try/catch, and parallel…
5 min read
JavaScript Project: To-Do List App
Build a complete to-do list app step by step with state, rendering, events, delegation, filters and localStorage, using…
7 min read
The language for storing and querying data in databases like MySQL and PostgreSQL.
SQL Introduction
What databases and SQL are, why almost every app uses them, the main database systems, and how to…
4 min read
SQL Databases and Tables
Create tables with CREATE TABLE, choose data types, understand primary keys and NULL, and load the practice shop…
5 min read
SQL SELECT
Read data with SELECT: choose columns, avoid SELECT * in real code, rename columns with AS, calculate new…
3 min read
SQL WHERE
Filter rows with WHERE using comparison operators, AND, OR and NOT, IN, BETWEEN, LIKE patterns and IS NULL,…
4 min read
SQL ORDER BY
Sort query results with ORDER BY, ascending and descending, by several columns and by calculated values, handle NULLs,…
4 min read
SQL INSERT
Add rows with INSERT INTO, list columns explicitly, insert several rows at once, use defaults and auto-generated ids,…
4 min read
SQL UPDATE
Change existing rows with UPDATE and SET, always target rows with WHERE, update several columns and calculated values,…
4 min read
SQL DELETE
Remove rows with DELETE safely, understand how foreign keys protect related data, compare DELETE, TRUNCATE and DROP, and…
4 min read
SQL Functions (COUNT, SUM, AVG)
Summarise data with aggregate functions COUNT, SUM, AVG, MIN and MAX, understand how they treat NULL, and use…
4 min read
SQL GROUP BY
Calculate totals per category, per customer and per month with GROUP BY, filter groups with HAVING, and understand…
4 min read
SQL JOINs (INNER JOIN)
Combine rows from related tables with INNER JOIN, use table aliases, join three or four tables, and build…
5 min read
SQL LEFT JOIN
Keep every row from the first table with LEFT JOIN, find rows without matches, count zero values correctly,…
5 min read
SQL Constraints and Keys
Protect data quality with PRIMARY KEY, FOREIGN KEY, UNIQUE, NOT NULL, CHECK and DEFAULT constraints, choose ON DELETE…
5 min read
SQL Indexes
How indexes make queries fast, when to create them, composite indexes and column order, reading EXPLAIN plans, and…
5 min read
SQL Project: Library Database
Design, build and query a complete library database with authors, books, members and loans, using tables, constraints, joins,…
7 min read
A beginner-friendly language used for automation, data and AI.
Python Introduction
What Python is, why it's the most popular first programming language, what people build with it, and your…
4 min read
Installing Python
Install Python 3 on Windows, macOS or Linux, check it works, use the interactive shell, run your first…
5 min read
Python Syntax
The basic grammar of Python: statements, indentation and blocks, comments and docstrings, long lines, naming rules and reading…
4 min read
Python Variables
Create variables with assignment, understand that names refer to objects, assign several values at once, swap values, use…
4 min read
Python Data Types
Python's built-in types (int, float, str, bool, None, list, tuple, dict and set), checking types, converting between them,…
4 min read
Python Strings
Create strings, index and slice them, use the essential string methods, format text with f-strings, and loop over…
4 min read
Python Numbers
Integers and floats, all arithmetic operators, rounding, the math and random modules, exact money calculations with Decimal, and…
4 min read
Python Lists
Create, index, slice and change lists; add, remove, sort and search items; copy lists safely; and write list…
4 min read
Python Tuples and Sets
Use tuples for fixed groups of values and unpacking, and sets for unique items, fast membership tests and…
4 min read
Python Dictionaries
Store key-value data in dictionaries: read safely with get, add, update and delete keys, loop over items, nest…
5 min read
Python If/Else
Make decisions with if, elif and else, combine conditions with and, or and not, use membership and identity…
5 min read
Python Loops
Repeat code with for and while loops, use range, enumerate and zip, control loops with break, continue and…
4 min read
Python Functions
Define functions with def, use parameters, return values, default and keyword arguments, *args and **kwargs, type hints, docstrings,…
5 min read
Python Modules
Import modules, explore the standard library, write your own modules, understand if __name__ == "__main__", and organise code…
5 min read
Python Files
Read and write text files safely with open() and with, process files line by line, append data, work…
5 min read
Python Errors and Exceptions
Handle errors with try, except, else and finally, catch specific exceptions, raise your own, create custom exception classes,…
5 min read
Python Classes and Objects
Object-oriented programming in Python: define classes, create objects, use __init__, attributes and methods, class attributes, special methods, properties,…
6 min read
Python pip and Packages
Install third-party packages from PyPI with pip, isolate projects with virtual environments, record dependencies in requirements.txt, and choose…
4 min read
Python JSON and APIs
Convert between Python and JSON, save and load JSON files, call web APIs with urllib and requests, send…
5 min read
Python Project: Simple Expense Tracker
Build a command-line expense tracker step by step with a dataclass, functions, JSON storage, error handling, reports by…
6 min read
Java Introduction
What Java is, why it powers banks, Android and big companies, how the JDK, JRE and JVM fit…
4 min read
Installing Java and Running Programs
Install the JDK on Windows, Mac or Linux, compile and run with javac and java, try code instantly…
3 min read
Java Variables and Data Types
Declare variables, learn Java's eight primitive types, String, var, constants with final, type casting, integer overflow and naming…
4 min read
Java Operators and Expressions
Arithmetic, assignment, comparison, logical, increment and ternary operators in Java, operator precedence, short-circuit evaluation and the Math class.
4 min read
Java Strings
Create and use Strings in Java, the most useful String methods, why == fails and equals() works, the…
4 min read
Java User Input with Scanner
Read numbers and text from the keyboard with Scanner, avoid the nextInt/nextLine trap, validate input, and print neat…
4 min read
Java If, Else and Switch
Make decisions in Java with if, else if, else, nested conditions, the classic switch statement and the modern…
4 min read
Java Loops
Repeat work with for, while, do-while and the enhanced for-each loop, control loops with break and continue, nested…
4 min read
Java Arrays
Store many values in one variable with Java arrays, loop over them, find max and average, use 2D…
4 min read
Java Methods
Write reusable Java methods with parameters and return values, understand pass-by-value, overload methods, use varargs and watch recursion…
4 min read
Java ArrayList and Collections
Use ArrayList, LinkedList, HashSet and TreeSet, understand how an ArrayList grows, generics, wrapper classes, autoboxing, iterating safely and…
5 min read
Java HashMap and Maps
Store key-value pairs with HashMap, LinkedHashMap and TreeMap, count frequencies with merge and getOrDefault, iterate entries, and see…
4 min read
Data structures and algorithms, one pattern at a time, with live animations you can play, pause and replay.
DSA Introduction
What data structures and algorithms really are, why every big tech interview tests them, the 15 patterns that…
5 min read
Big O Notation
Measure how an algorithm's work grows with input size. Learn O(1), O(log n), O(n), O(n log n), O(n²)…
5 min read
Arrays and Strings
How arrays live in memory, why indexing is O(1) but inserting is O(n), linear search, in-place techniques, and…
5 min read
Hashing: Hash Maps and Sets
The most useful tool in DSA. How hash maps and sets give O(1) lookups, and the patterns they…
5 min read
Two Pointers
Solve sorted-array and pair problems in one pass with O(1) memory. Opposite-end pointers, slow and fast writer pointers,…
5 min read
Sliding Window
Solve "best contiguous subarray or substring" problems in O(n). Fixed-size windows, growing and shrinking windows, and the template…
5 min read
Prefix Sums
Precompute running totals once and answer any range sum in O(1). Then combine prefix sums with a hash…
4 min read
Kadane’s Algorithm: Maximum Subarray
Find the contiguous subarray with the biggest sum in one pass. The "extend or restart" idea behind Kadane's…
4 min read
Binary Search
Halve the search space every step for O(log n). The bug-free template, first and last positions, search insert…
5 min read
Sorting Basics
Bubble, selection and insertion sort animated step by step, what stable sorting means, Python's built-in sort with custom…
5 min read
Merge Sort and Quick Sort
The two classic O(n log n) sorting algorithms, animated. Divide and conquer, merging sorted halves, partitioning around a…
5 min read
Recursion
Functions that call themselves, explained with a live call tree. Base cases, the call stack, the "trust the…
5 min read
Backtracking
Explore every choice with choose, explore, un-choose. Subsets, permutations, combination sum, generate parentheses and word search, with a…
5 min read
Linked Lists
Nodes connected by pointers. Build a linked list in Python, traverse, insert and delete, reverse it with three…
5 min read
Fast and Slow Pointers
The tortoise and hare technique. Find the middle of a linked list, detect cycles and where they start,…
6 min read
Stacks
Last in, first out. Use Python lists as stacks, match brackets (animated), build a min stack, evaluate expressions,…
5 min read
Monotonic Stack
A stack kept in sorted order answers "next greater" and "previous smaller" questions in O(n). Daily temperatures, stock…
5 min read
Queues and Deques
First in, first out. Use collections.deque for O(1) queues, build a queue from two stacks, process things in…
4 min read
Binary Trees and Traversals
Nodes with left and right children. Build trees in Python, watch inorder, preorder, postorder and level-order traversals, and…
6 min read
Binary Search Trees
Trees kept in sorted order. Search and insert in O(log n) (animated), validate a BST with bounds, find…
6 min read
Heaps and Priority Queues
Always know the smallest item in O(1) and add or remove in O(log n). Python's heapq, max-heaps with…
5 min read
Graphs: BFS and DFS
Model networks of friends, cities and web pages. Adjacency lists, breadth-first and depth-first search animated, connected components, shortest…
6 min read
Grid Problems (Flood Fill and BFS)
Treat a 2D grid as a graph. Count islands with flood fill (animated), find the largest area, spread…
5 min read
Topological Sort
Order tasks so every prerequisite comes first. Kahn's algorithm with in-degrees (animated), the DFS version, detecting impossible cyclic…
5 min read
Shortest Paths (Dijkstra)
Find the cheapest route in a weighted graph. Dijkstra's algorithm with a heap (animated), why it needs non-negative…
6 min read
Dynamic Programming (1D)
Dynamic programming without the fear. Remember answers instead of recomputing them. Memoization vs tabulation, climbing stairs and coin…
6 min read
2D Dynamic Programming
DP tables with rows and columns. Unique paths in a grid, longest common subsequence animated cell by cell,…
6 min read
Greedy Algorithms and Intervals
Make the best local choice and never look back. When greedy works (and when it fails), merging intervals…
6 min read
The DSA Interview Playbook
Everything in one place. A pattern cheat sheet that maps problem clues to techniques, a 6-step method for…
5 min read
Classic coding interview problems solved step by step: brute force first, then the optimal pattern, in Python.
Two Sum
Find two numbers that add up to a target. The most famous interview warm-up, solved in one pass…
2 min read
Contains Duplicate
Does any value appear twice? Three solutions from slow to fast, and why a set wins.
2 min read
Valid Anagram
Are two words made of exactly the same letters? Count letters with a dictionary or Counter.
2 min read
Group Anagrams
Put words with the same letters into groups. The trick is choosing a good dictionary key.
2 min read
Top K Frequent Elements
Return the k most common numbers. Count with a dictionary, then pick the top k with a heap…
2 min read
Product of Array Except Self
For every position, multiply everything except that number, without using division. Prefix and suffix products make it O(n).
2 min read
Longest Consecutive Sequence
Find the longest run of consecutive numbers in an unsorted list in O(n), by only counting from the…
2 min read
Valid Palindrome
Does a sentence read the same backwards, ignoring spaces and punctuation? Two pointers walking towards each other.
2 min read
Container With Most Water
Pick two walls that hold the most water. Start wide and always move the shorter wall inwards.
2 min read
3Sum
Find all unique triplets that sum to zero. Sort, fix one number, then run two pointers on the…
2 min read
Trapping Rain Water
How much rain collects between bars of different heights? The water above each bar depends on the tallest…
2 min read
Best Time to Buy and Sell Stock
Buy once, sell once, maximise profit. Track the cheapest price so far in a single pass.
2 min read
Longest Substring Without Repeating Characters
The textbook sliding window problem. Grow the window to the right; when a letter repeats, shrink from the…
2 min read
Minimum Window Substring
Find the smallest part of a string that contains every letter of another string. Expand until valid, then…
2 min read
Subarray Sum Equals K
Count continuous subarrays that add up to k, even with negative numbers. Prefix sums plus a hash map…
2 min read
Maximum Subarray
Find the continuous part of a list with the biggest sum. Kadane's algorithm: keep going while the running…
2 min read
Binary Search
Find a target in a sorted list in O(log n). The bug-free template, first and last position, and…
2 min read
Search in Rotated Sorted Array
A sorted list was rotated at an unknown point. Binary search still works, because one half is always…
2 min read
Koko Eating Bananas
Binary search on the answer. Find the slowest eating speed that still finishes all bananas in time.
2 min read
Valid Parentheses
Are the brackets balanced and correctly nested? Push opening brackets on a stack; each closing bracket must match…
2 min read
Min Stack
Design a stack that returns its minimum in O(1). Store the minimum-so-far alongside every item.
2 min read
Daily Temperatures
How many days until a warmer day? A monotonic stack of waiting days answers it in one pass.
2 min read
Largest Rectangle in Histogram
The biggest rectangle that fits under a bar chart. For each bar, find how far it can stretch…
2 min read
Reverse Linked List
Flip the direction of every arrow in a linked list with three pointers. Iterative and recursive versions.
2 min read
Merge Two Sorted Lists
Zip two sorted linked lists into one sorted list. The dummy node trick removes every special case.
2 min read
Linked List Cycle
Does a linked list loop back on itself? A tortoise and a hare running at different speeds will…
2 min read
LRU Cache
Design a cache that throws out the least recently used item when full, with O(1) get and put.…
3 min read
Maximum Depth of Binary Tree
How many levels does a tree have? A three-line recursive answer, plus the level-by-level BFS version.
2 min read
Invert Binary Tree
Mirror a binary tree by swapping every node's left and right children. Short, famous and a perfect recursion…
2 min read
Binary Tree Level Order Traversal
Return the tree's values level by level. BFS with a queue, processing one whole level per loop.
2 min read
Validate Binary Search Tree
Is a tree a valid BST? Checking only parent and child is a trap; pass an allowed range…
2 min read
Lowest Common Ancestor of a Binary Tree
Find the deepest node that has both p and q below it. One elegant recursion that reports what…
2 min read
Kth Largest Element in an Array
Find the k-th largest number without sorting everything. A min-heap of size k, plus quickselect for an average…
2 min read
Merge k Sorted Lists
Merge many sorted linked lists into one. A min-heap always tells you which list has the next smallest…
2 min read
Number of Islands
Count groups of connected land in a grid. Each time you step on new land, count it and…
2 min read
Rotting Oranges
How many minutes until every orange rots? Multi-source BFS where each level of the queue is one minute.
2 min read
Course Schedule
Can you finish every course given the prerequisites? Only if there's no cycle. Kahn's algorithm takes courses as…
2 min read
Network Delay Time
How long until a signal reaches every computer? Dijkstra's shortest paths, then take the slowest arrival.
2 min read
Word Ladder
Change one letter at a time to turn one word into another. Words are nodes, one-letter changes are…
2 min read
Subsets
List every possible subset. For each item, choose "take it" or "skip it"; backtracking explores both.
2 min read
Permutations
List every ordering of a set of numbers. Fill positions one by one with numbers not used yet,…
2 min read
Combination Sum
Find every combination of numbers (reusable) that adds up to a target. Backtracking with a start index and…
2 min read
Climbing Stairs
How many ways to climb n stairs taking 1 or 2 steps? The gentlest introduction to dynamic programming.
2 min read
House Robber
Take the most money without robbing two neighbouring houses. At each house, choose "rob it" or "skip it",…
2 min read
Coin Change
The fewest coins that make an amount. Why greedy fails, and how a DP table builds every amount…
2 min read
Longest Increasing Subsequence
The longest rising sequence you can pick from a list (gaps allowed). An O(n²) DP, then a clever…
2 min read
Longest Common Subsequence
The longest sequence of letters two strings share in order. The doorway into 2D dynamic programming, with an…
2 min read
Edit Distance
The fewest insertions, deletions and replacements to turn one word into another. The algorithm behind spell-checkers and DNA…
2 min read
Merge Intervals
Combine overlapping time ranges into one. Sort by start, then extend or start a new block in a…
2 min read
Meeting Rooms II
How many meeting rooms do you need? Sort by start and keep a min-heap of end times, or…
2 min read
Jump Game
Can you reach the last index if each number is your maximum jump? Track the farthest reachable point…
2 min read