MDN web docs for frontend and protocols: <a href="https://developer.mozilla.org/en-US/" rel="nofollow">https://developer.mozilla.org/en-US/</a><p>Your backend framework's official docs, for example <a href="https://docs.djangoproject.com/en/3.2/" rel="nofollow">https://docs.djangoproject.com/en/3.2/</a>