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Learn to Code with Instant Feedback
The modern, interactive learning platform designed for everyone. Practice HTML, CSS, JavaScript, Python, SQL & React directly in your browser and earn verifiable certificates.
HTML Introduction
Course: HTML5
Popular Learning Tracks
Structured step-by-step curricula with interactive exercises and real code runners.
HTML5
The standard markup language for structuring all web pages and applications.
<!DOCTYPE html>
<html>
<h1>Hello World</h1>
</html>CSS3
The stylesheet language used to format, layout, and style modern websites.
body {
background: #0f172a;
color: #04AA6D;
}JavaScript
The programming language that powers interactive behaviors on the web.
const greet = (name) =>
`Hello ${name}!`;
console.log(greet("Coder"));Python
The world's leading high-level language for Artificial Intelligence, data, and web backends.
for n in range(5):
print(f"Count: {n}")SQL Databases
The standard language for querying, updating, and administering relational databases.
SELECT * FROM Customers
WHERE Country = 'Germany';React.js
The most popular frontend library for building reusable component-driven user interfaces.
function Button() {
return <button>Click</button>;
}Explore All 54 Coding Tracks
Every course contains human-written lessons, executable code sandboxes, interactive practice exercises, and verified certification exams.
HTML5 Tutorial
The standard markup language for creating web pages and web applications.
CSS3 Tutorial
The stylesheet language used to describe the presentation and design of web documents.
JavaScript Tutorial
The programming language of the Web that enables interactive and dynamic user experiences.
Python Tutorial
A versatile, beginner-friendly programming language used in AI, data science, and web backends.
SQL Database Tutorial
The standard language for storing, querying, and manipulating data in relational databases.
React.js Tutorial
The most popular declarative, component-based front-end JavaScript library for building modern user interfaces.
Java Tutorial
A powerful, robust, object-oriented programming language used for enterprise backends and Android systems.
C Programming Tutorial
The foundation of modern operating systems, game engines, and embedded microcontrollers.
C++ Tutorial
High-performance systems programming, game development, modern RAII, and the Standard Template Library (STL).
C# Tutorial
Modern, object-oriented language developed by Microsoft for enterprise cloud, web APIs, and Unity game development.
PHP Tutorial
A widely-used open source server-side scripting language especially suited for web development and database management.
Go (Golang) Tutorial
A fast, simple, statically compiled language designed by Google for cloud infrastructure, microservices, and concurrency.
Rust Tutorial
A blazingly fast, memory-safe language with zero runtime garbage collection, powering modern browsers and systems.
Node.js Tutorial
Run JavaScript on the server with high-performance asynchronous event-driven I/O built on Chrome V8 engine.
TypeScript Tutorial
A strongly typed programming language that builds on JavaScript, giving you better tooling and error prevention at any scale.
Django Tutorial
A high-level Python web framework that encourages rapid development, clean pragmatic design, and batteries-included security.
Bash Shell Scripting Tutorial
Automate tasks, manage Linux servers, chain pipelines, and build DevOps scripts with Bash.
ASP.NET Core Tutorial
A modern, open-source, cross-platform framework for building cloud-enabled internet-connected services, web apps, and APIs with C#.
MySQL Relational Database Tutorial
The world's most popular open-source relational database management system (RDBMS) powering web giants and modern cloud applications.
PostgreSQL Advanced Architect Tutorial
The world's most advanced open-source relational database featuring native JSONB, MVCC concurrency, full-text search, and geospatial extensions.
MongoDB NoSQL Database Tutorial
The leading modern NoSQL document database designed for high availability, horizontal scalability, and rapid JSON application development.
Vue.js 3 Progressive Framework Tutorial
Master Vue 3, the Composition API, Single-File Components, Pinia state management, and Vue Router.
Angular Enterprise Framework Tutorial
Build scalable enterprise web applications with TypeScript, dependency injection, RxJS streams, and Standalone Components.
jQuery DOM Library Tutorial
Master DOM traversal, event handling, animations, AJAX requests, and migrating legacy codebases to modern JavaScript.
Sass / SCSS Preprocessor Tutorial
Master professional CSS preprocessing: variables, nesting, mixins, modules (@use), functions, and scalable architecture.
Bootstrap 5 Responsive Framework Tutorial
Build modern responsive websites quickly with Bootstrap 5's 12-column grid, utility classes, and vanilla JS components.
JSON Data Architecture Tutorial
Master JavaScript Object Notation: syntax rules, parsing, serialization, REST APIs, JSON Schema, and JWT authentication.
Artificial Intelligence Tutorial
Foundations of AI, machine intelligence, neural networks, computer vision, and autonomous agent systems.
Generative AI Tutorial
Master LLMs, diffusion models, prompt engineering, RAG pipelines, fine-tuning, and autonomous agents.
NumPy Tutorial
High-performance scientific computing, multi-dimensional ndarrays, broadcasting, and numerical algebra in Python.
Pandas Tutorial
Data wrangling, exploratory data analysis (EDA), Series, DataFrames, groupby, time-series, and cleaning.
Git Version Control Tutorial
The distributed version control system used by software teams worldwide to track changes, branch, and collaborate on GitHub.
AWS Cloud Computing Tutorial
Master Amazon Web Services: IAM, EC2, S3, VPC networking, Lambda serverless, RDS, and CloudWatch.
Cyber Security Tutorial
Web application security, OWASP Top 10, cryptography, SQL injection, XSS, CSRF, and Zero Trust architecture.
Data Structures & Algorithms (DSA)
Master Big-O analysis, linked lists, stacks, queues, hash maps, trees, sorting, and graph traversals for technical interviews.
Kotlin Tutorial
Modern language for Android development and multiplatform systems: Null safety, coroutines, extension functions, and data classes.
Swift Tutorial
The powerful, intuitive programming language for iOS, iPadOS, macOS, watchOS, and visionOS apps.
Excel for Data Analysis Tutorial
Spreadsheets, formulas, VLOOKUP/XLOOKUP, Pivot Tables, conditional formatting, and Power Query.
W3.CSS Tutorial
A modern, responsive, mobile-first CSS framework with no jQuery or JavaScript library dependencies.
XML Tutorial
eXtensible Markup Language: designed to store and transport data in a self-descriptive, hierarchical format.
SVG & HTML5 Canvas Tutorial
Vector graphics with SVG and pixel-manipulated 2D raster rendering with HTML5 Canvas.
AJAX & Fetch API Tutorial
Master asynchronous HTTP requests, XMLHttpRequest, Promises, modern Fetch API, async/await, and CORS.
Web Accessibility (a11y) Tutorial
Build inclusive, WCAG-compliant web experiences for all users with semantic HTML, ARIA, and keyboard navigation.
Machine Learning with Python Tutorial
Supervised and unsupervised algorithms: Scikit-Learn, regression, classification, clustering, and model evaluation.
SciPy Scientific Computing Tutorial
Master scientific computing, numerical integration, optimization, linear algebra, signal processing, and spatial algorithms in Python.
Matplotlib Data Visualization Tutorial
Create publication-ready line charts, bar plots, scatter plots, histograms, subplots, and 3D figures in Python.
R Statistical Programming Tutorial
Learn the definitive language for statistics, bioinformatics, linear modeling, ggplot2, and data science.
Data Science & Statistical Analysis
Understand the end-to-end data lifecycle: data wrangling, descriptive statistics, probability distributions, hypothesis testing, and machine learning evaluation.
Google Sheets & Cloud Spreadsheets Mastery
Master online spreadsheets, collaborative formulas, VLOOKUP, XLOOKUP, QUERY, Pivot Tables, and Apps Script automation.
ChatGPT & LLM AI Engineering Guide
Master prompt engineering, few-shot prompting, system instructions, RAG, function calling, and building production LLM apps with GPT-4 and Gemini.
Introduction to Computer Programming
Learn the universal foundations of coding: memory, variables, control flow, functions, data structures, debugging, and clean architecture.
Responsive Web Design, Colors & UI Systems
Master modern responsive layouts (RWD), mobile-first CSS media queries, accessible color palettes, flexbox/grid architectures, and SVG icon systems.
Raspberry Pi & IoT Engineering
Build home automation, IoT sensors, Linux servers, and hardware GPIO controllers with Raspberry Pi, Python, and Linux daemons.
How-To: 50+ Real-World Developer Recipes
Master modern frontend and full-stack recipes: clipboard access, dark mode, accessible dialogs, accordions, carousels, and search filters.
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Real-Time Sandboxes
Execute HTML, CSS, JavaScript, Python, and SQL queries instantly in the browser without installing any compilers or dependencies.
Verifiable Certificates
Earn professional certificates with unique verification IDs and QR codes that can be added to your LinkedIn and resume.
XP Levels & Auto-Resume
Level up from Novice Coder to Grandmaster Hacker. Your progress and last studied position are automatically saved.