It's my impression that on this site (and https://math.stackexchange.com/) that many times questions aren't answered but just hints in the comments are given. (This is different on https://mathematica.stackexchange.com where unless it's obvious a homework problem or self-study a detailed answer is many times given.)
If my impression is not wrong, are there guidelines as to when to give hints as opposed to detailed answers? If my impression is wrong, I'd like to hear about that, too.