It is easier to regurgitate your answer across dozens of questions than to bother finding any canonical question.
On topic GitHub questions are about its API, pushing/pulling, or things with actual code.
Off topic GitHub questions that belong on Web Applications:
- about using the UI
- repo settings and admin interface (including GitHub Gists)
- making images show on your README.md or other file
- your profile or account
- what time they set their servers
- and other parts of the interface
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