If you're presenting what you have on Github to a potential employer as a shining example of what you're capable of, then yeah, it should be polished as hell, b

If you're presenting what you have on Github to a potential employer as a shining example of what you're capable of, then yeah, it should be polished as hell, because you are literally presenting it to someone as an example of the heights that you're capable of and why they should hire you. If instead it's just a casual place where you mostly just plop random stuff to share with friends, that's fine too, but don't show it to a potential employer, any more than you would send them links to all those social media posts that you don't want them to judge you by. It's pretty simple. If you're going through some company's hiring process and slip in a, "hey, by the way, check me out on Github", they will naturally interpret its contents as an example of you at your best, because otherwise why would you want them to check it out? Job seekers don't go out of their way to publicize their Github output on their resume if it's just a place for brain dumps and code snippets. Nothing wrong with using it that way of course, but it's not a useful thing to show to hiring managers, in the same way that I wouldn't go out of my way to show them my class notes or old tests from college. It's not relevant, and may even give them the wrong impressions.