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Build practical technology skills through structured courses, runnable lessons, guided projects, quizzes, and progress you can continue across devices.

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Popular Technologies

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  • Interactive Lessons

    Learn by doing

  • Code Playground

    Practice in your browser

  • Quizzes & Review

    Test your skills

  • Guided Projects

    Build complete solutions

  • Certificates

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Browse technologies

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Choose a technology and start learning through structured lessons, practical exercises, and guided projects.

How a lesson works

Read a short, focused lesson

Plain-language explanations with a working example before any exercise.

Edit and run real code

HTML/CSS/JS in a sandboxed browser, Python via Pyodide, SQL against a real dataset — right in the lesson.

Prove it with exercises and quizzes

Deterministic checks and progressive hints, never a guessed pass.

Choose a topic

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Every topic below is independent. Open any course directly — nothing here needs to be completed in order.

Digital & Coding Foundations

How computers, files, and the web actually work — the mental model every developer needs before writing a line of code.

3 lessons

HTML & CSS

Structure and style real web pages, then make them responsive and accessible.

8 lessons

JavaScript

Bring pages to life: logic, interactivity, the DOM, and asynchronous data.

9 lessons

TypeScript

Add a type system to JavaScript so mistakes surface while you write, not in production.

12 lessons

React

Build real, componentized user interfaces — from JSX fundamentals to data fetching, custom hooks, and production-ready structure.

14 lessons

Node.js & Express

Build and operate a real backend REST API: routing, middleware, validation, error handling, and testing.

14 lessons

Java

A statically-typed, object-oriented language behind much of the enterprise and Android world — from the JVM's execution model through modern streams and real automated testing.

14 lessons

Data Structures & Algorithms

How to reason about time and space, and the structures — arrays, trees, graphs, hash tables — every efficient program is built from.

14 lessons

Python

A general-purpose language for scripting, data, and the backend of AI apps.

8 lessons

Git, APIs & SQL

Version your work, talk to servers over HTTP, and query real databases.

9 lessons

Database Design & PostgreSQL

Beyond basic SQL: relational modeling, normalization, transactions, indexing, and the operational discipline a real production database needs.

14 lessons

AI, LLMs, RAG & Agents

From how language models work to building grounded, cited retrieval-augmented AI applications.

14 lessons

Software Testing & QA

Think like a tester: design techniques, risk-based planning, and clear defect reporting — plus automated API validation.

28 lessons

Playwright Web Automation

Automate real browsers with a modern, reliable API — locators, auto-waiting, fixtures, network mocking, and CI-ready end-to-end tests.

14 lessons

Selenium WebDriver Automation

The long-established, widely-deployed browser automation standard — WebDriver, explicit waits, page objects, and JUnit-driven test suites in Java.

14 lessons

Linux & Shell Fundamentals

Linux user-space fundamentals and safe, automation-oriented Bash scripting — the command-line literacy underneath testing, CI, and backend work.

14 lessons

Test Automation Framework Engineering

The architecture behind a maintainable automation suite: layering, fixtures, test data, CI quality gates, and framework health at scale.

14 lessons

Placement & Career Readiness

Quantitative aptitude, logical and analytical reasoning, and group discussion and interview preparation for campus placements.

36 lessons

Study-Abroad Exam Preparation

Independent, self-paced preparation for the English-proficiency and graduate-admissions tests most study-abroad applications require: IELTS, PTE Academic, TOEFL iBT, and the GRE General Test.

48 lessons

Go Programming

A simple, statically-typed, compiled language built for concurrency and fast builds -- widely used for backend services, CLIs, and cloud infrastructure tooling.

12 lessons

C Programming

The systems language behind operating systems, embedded devices, and most other languages' runtimes -- manual memory management, pointers, and the C standard library.

12 lessons

C++ Programming

C's performance and control plus classes, templates, RAII, and the Standard Template Library -- still foundational for games, finance, and high-performance systems.

12 lessons

C#/.NET Fundamentals

A modern, statically-typed language and the .NET runtime behind it -- from language fundamentals through async/await and building a real console/API application.

12 lessons

PHP Web Development

The language behind a large share of the web's backends -- from request handling and forms through modern PHP practices like Composer and PSR autoloading.

12 lessons

Kotlin Fundamentals

A modern, null-safe language that runs on the JVM (and beyond) -- Android's preferred language, and increasingly used for backend services too.

12 lessons

Angular Application Development

A full, opinionated framework for large single-page applications -- components, dependency injection, RxJS, and routing, using modern (post-AngularJS) Angular.

12 lessons

AngularJS Legacy Maintenance

AngularJS (1.x) reached end of life in 2022 and is not recommended for new projects -- this track exists to help you read, maintain, and safely modernize an existing AngularJS codebase.

12 lessons

Build real projects

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Guided projects connect several lessons into one complete, real build.

Personal Portfolio Page

Design and build a responsive, semantic, accessible one-page portfolio using only HTML and CSS.

beginner4h

Interactive Quiz Application

Build a multi-question quiz app in vanilla JavaScript: render questions, track score, and show a results screen.

beginner5h

Expense Tracker

Write a Python program that records expenses, categorizes them, and reports totals — using functions, lists/dicts, and file persistence.

beginner5h

Built for people who learn by doing

Every lesson pairs a short explanation with real, runnable code and deterministic checks — not just prose to read and hope you understood. Guest progress, mastery tracking, and spaced review work with zero setup; create an account only when you want your progress to follow you across devices.

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