Ask HN: Most useful GitHub repos to learn from or to use as reference?

I&#x27;m always looking to expand my knowledge of CS fundamentals, JavaScript and best software engineering practices.<p>I have several Github repos bookmarked that I find super useful and have learned a ton from...<p>online CS courses: https:&#x2F;&#x2F;github.com&#x2F;prakhar1989&#x2F;awesome-courses<p>frontend related case studies: https:&#x2F;&#x2F;github.com&#x2F;andrew--r&#x2F;frontend-case-studies<p>cloning Medium.com with with different frontend + backends: https:&#x2F;&#x2F;github.com&#x2F;gothinkster&#x2F;realworld<p>literally a CS university online: https:&#x2F;&#x2F;github.com&#x2F;jwasham&#x2F;coding-interview-university<p>How about you?