A calm path from first line to real work

Learn to code
one small lesson
at a time.

Eleven tracks, four levels each. Every lesson explains plainly, shows the code line by line, and lets you run, break, and fix things right here. No setup, no noise.

Browse all courses Open playground

How it works

  1. 1. Pick a language — start with HTML if unsure.
  2. 2. Read the short lesson, run the example, change it.
  3. 3. Pass the checks, try the quiz, tick it done.
Start with HTML

Tracks

Eleven starting points. Each goes beginner → expert.

All courses

HTML

The structure of every web page.

Start from zero: what a document is, how tags work, and how to build real pages with headings, links, images, and forms.

12h · 3 lessons0%

CSS

Make pages readable and beautiful.

From zero: selectors, the box model, and layout. Style real pages and see changes instantly.

14h · 3 lessons0%

JavaScript

Make pages interactive and think in code.

From zero: variables, loops, functions. Run everything in the browser.

25h · 3 lessons0%

Python

Readable code for everything.

From zero: variables, loops, functions. Runs in your browser with Pyodide.

25h · 3 lessons0%

Java

Strict, reliable, everywhere.

From zero: what a class is, variables with types, loops, methods. Runs via the execution backend.

30h · 3 lessons0%

C++

Fast, close to the metal.

From zero: programs, variables, loops, functions. Runs via the execution backend.

30h · 3 lessons0%

Roadmaps, not mazes

Each language has a roadmap page: levels, modules, and what is still ahead. Search with Ctrl+K to jump anywhere.

Run first, theory second

HTML, CSS, JavaScript, Python, and SQL run entirely in your browser. The rest use a small execution service you can self-host.