Fix a lesson
Correct an unclear sentence, broken example, typo, or accessibility issue.
Open source education
Make one lesson clearer for the next learner.
You do not need to be a senior engineer. Useful examples, simpler words, corrected mistakes, and better questions all matter.
Open the public repositoryAdd an exercise
Contribute a prediction task, bug hunt, quiz, or practical mini-project.
Build a course
Help turn a mapped language or tool into a complete, reviewed learning path.
Improve the site
Work on performance, responsive design, accessibility, or the curriculum engine.
Quality standard
Clear beats clever.
- Assume the learner knows nothing yet.
- Explain the purpose before the syntax.
- Use small, working, testable examples.
- Never hide a safety or security risk.
- Keep text readable on phones and keyboards usable.
- Do not present AI output as verified without checking it.
Read CONTRIBUTING.md in the repository for branch, lesson, review, and pull-request instructions.