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Java

Available Now

Object-Oriented. Powerful. Everywhere.

Learn Java from the ground up: variables, control flow, OOP, collections, generics, streams, concurrency, design patterns, reflection, NIO, the Java Memory Model, and modern Java 21 features. A complete curriculum with 95 structured topics across three levels.

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95 topics

475+ exercises

380+ quiz Qs

95+ hrs

✓40 beginner topics: variables, operators, control flow, loops, arrays, strings, methods, and OOP

✓35 intermediate topics: Collections, Generics, Streams, File I/O, Concurrency, and Modern Java

✓20 advanced topics: CompletableFuture, design patterns, reflection, NIO, JMM, virtual threads, and Java 21 features

✓Run Java code directly in the browser with instant output

Beginner · 40 topicsIntermediate · 35 topicsAdvanced · 20 topics

🌐

HTML

Available Now

The Language of the Web

Master HTML from the ground up structure, semantics, forms, tables, accessibility, SEO, and modern HTML5 elements. Build real web pages with confidence.

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75 topics

375+ exercises

300+ quiz Qs

40+ hrs

✓40 beginner topics: document structure, text, links, images, media, lists, tables, forms, and SEO

✓35 intermediate topics: advanced forms, responsive images, SVG, Canvas, Web Components

✓Accessibility: ARIA roles, live regions, skip links, focus management, keyboard patterns

✓Performance: resource hints, lazy loading, font-display, fetchpriority, image optimization

Beginner · 40 topicsIntermediate · 35 topics

🎨

CSS

Available Now

Style the Web

Master CSS from the ground up selectors, the box model, flexbox, grid, animations, and responsive design. Build beautiful, accessible, and maintainable stylesheets.

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30 topics

150+ exercises

120+ quiz Qs

25+ hrs

✓30 beginner topics: selectors, colors, box model, flexbox, grid, transitions, and transforms

✓CSS Foundations: cascade, specificity, inheritance, and the three ways to apply CSS

✓Modern layout: Flexbox and CSS Grid with responsive patterns

✓CSS Variables, web fonts, pseudo-classes, and keyframe animations

Beginner · 30 topics

🟨

JavaScript

Available Now

The Language of the Web

Learn JavaScript from the ground up variables, functions, closures, async/await, and the modern ES2024+ features every developer needs to know.

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42 topics

210+ exercises

168+ quiz Qs

40+ hrs

✓Complete beginner track: strings, numbers, JSON, Sets, Maps, dates, error handling

✓Async JavaScript: callbacks, Promises, async/await, and streams

✓OOP, functional programming, design patterns, and meta-programming

✓Performance, memory management, Web Workers, and Proxy/Reflect

Beginner · 22 topicsIntermediate · 10 topicsAdvanced · 10 topics

🐍

Python

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Simple. Powerful. Everywhere.

Learn Python from scratch variables, control flow, functions, data structures, error handling, and the standard library. All exercises run right in your browser.

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35 topics

175+ exercises

140+ quiz Qs

40+ hrs

✓35 topics from syntax basics to concurrency, metaclasses, and performance

✓Data structures: lists, tuples, sets, dictionaries, and comprehensions

✓OOP: classes, inheritance, special methods, descriptors, ABCs, and design patterns

✓Advanced: threading, asyncio, multiprocessing, itertools, and memory optimisation

Beginner · 15 topicsIntermediate · 10 topicsAdvanced · 10 topics

🐘

PostgreSQL

Available Now

Master SQL & Databases

A complete, interactive guide to PostgreSQL from writing your first query to advanced performance tuning, window functions, JSONB, and security. All exercises run in your browser.

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88 topics

500+ exercises

400+ quiz Qs

40+ hrs

✓Run real SQL in your browser, no install needed

✓88 structured topics from SELECT to partitioning

✓500+ exercises with instant result validation

✓Covers JSONB, CTEs, window functions, indexing & more

Beginner · 41 topicsIntermediate · 38 topicsAdvanced · 9 topics

🟢

Node.js

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JavaScript on the Server

Understand how Node.js works internally: the event loop, single-threaded architecture, streams, buffers, the file system, and advanced concurrency patterns with child processes, worker threads, and clustering.

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15 topics

90+ exercises

60+ quiz Qs

18+ hrs

✓6 beginner topics: single-threaded model, event loop, path, os, env vars, process object

✓3 intermediate topics: file system (fs), buffers, and streams

✓3 advanced topics: child processes, worker threads, and cluster module

✓3 practice projects: CLI notes app, streaming CSV reader, and HTTP file upload server

Beginner · 6 topicsIntermediate · 3 topicsAdvanced · 6 topics

🔷

TypeScript

Available Now

JavaScript with Superpowers

Master TypeScript from first principles types, interfaces, generics, utility types, mapped types, and the patterns every TypeScript developer needs to know.

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45 topics

225+ exercises

180+ quiz Qs

60+ hrs

✓15 beginner topics: types, inference, interfaces, generics, utility types

✓15 intermediate topics: advanced generics, decorators, async patterns, error handling

✓15 advanced topics: variance, nominal typing, HKT, type-state, compiler API, testing

✓Declaration files, module augmentation, recursive types, discriminated unions

Beginner · 15 topicsIntermediate · 15 topicsAdvanced · 15 topics

Coming Soon2 courses in progress

These courses are being built. Content drops regularly, check back soon.

⚡

Express.js

Fast Node.js Web APIs

Build production-ready REST APIs with Express.js. Covers routing, middleware, authentication, error handling, and integrating with PostgreSQL.

BackendNode.jsAPIs

Coming Soon

⚛️

React

Build Modern UIs

Master React from components and hooks to performance optimization and state management. Build real-world apps with modern React patterns.

FrontendUIWeb

Coming Soon