Something crazy weird just happened to me on GitHub yesterday. I'm not sure if I can understand what exactly happened; the audit trail looks ... self-incriminating.
Is this the right place to ask GitHub-related questions?
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If what you're asking is about interacting with GitHub from the command line
git, the GitHub application for Windows or Mac, or more generally, doing stuff with Git, then it'd be on topic here.
However, Git questions may also be asked on Stack Overflow. It's one of these "tools that programmers use", so you'd be fine to ask there as well. In fact, Git questions might get better exposure on Stack Overflow than here.
If your question only concerns operating GitHub's web interface, then Web Applications has got you covered. Might also be on-topic for Stack Overflow, but I'm not sure about that.