---
title: "Knowledge sources"
n3onlab_link_group: "knowledge"
---

# Knowledge sources

Open knowledge: documentation, courses, books and encyclopedias.

- **[Wikipedia](https://www.wikipedia.org/)** — The free, community-written encyclopedia; content licensed CC BY-SA. `CC-BY-SA-4.0`
- **[MDN Web Docs](https://developer.mozilla.org/)** — Open documentation for HTML, CSS and JavaScript, with examples. `CC-BY-SA-4.0` · [source code](https://github.com/mdn/content) · [[Tags/html|#HTML]] [[Tags/css|#CSS]] [[Tags/javascript|#JavaScript]]