C# Fundamentals
A structured course from your first lines of code to building your own small program.
Coding courses
Every course is built from chapters of short, hands-on lessons, for beginners and up.
8 courses652 lessonsFreeRuns in the browser
What is Codae?
Codae is an interactive way to learn programming by writing code. Each lesson is a short loop: read a short explanation, write the code yourself in a real editor in the browser, run it, and check whether the task is solved. There is nothing to install. You can start as a guest without an account; your progress then stays on this device. With a free Ostrae account, progress and settings sync across devices and the MICA coach becomes available.
Pick a language. Start today.
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HTML: Structuring Websites
Learn how to structure content semantically so that browsers and assistive technologies understand your website.
CSS: Styling Websites
Style the HTML website to be readable, responsive, and consistent.
JavaScript
From programming basics and DOM interaction to a complete frontend project with JavaScript.
Python Fundamentals and Automation
Beginner-friendly data processing and small automations using Python.
Git, GitHub and Hosting
Secure your work traceably and publish a website. Initially simulated repositories without external data; actual GitHub and hosting steps with your own project.
Design for Developers
Understand and apply design decisions yourself. Not a course for pixel-perfect screenshots, but for sound product and UI design.
GSAP Animations
Learn intentional and performant web animations using GSAP. From fundamentals, timelines, and interactions to ScrollTrigger and an accessible landing page.
How each lesson works
No hour-long videos. Each lesson is a short loop you complete yourself, until the idea sits.
Read
A short explanation and one clear task. Just enough to get going.
Write
You type the code yourself, in a real editor right in the browser.
Run
Run it and see what your program actually does, straight away.
Check
Check tells you whether the task is solved, and what is missing if not.