I've noticed that a lot of tag descriptions say questions should be at the graduate level or higher. I've been doing a lot of review lately (I have a bachelor's in math and I'm starting to delve in to computer science and stats), and find myself asking questions well below that level, but no-one seems to mind. Rather, people have been incredibly helpful and seem happy to lend a hand.
So I'm curious what the general consensus is on how welcome less advanced questions are. It seems like no matter how far you go, you still find yourself doubling back and questioning/reinvestigating the fundamentals you've been building on.