To first clarify this community, it’s not “don’t ask stupid questions” its “there are no stupid questions”. In other words, ask that thing you’ve wanted to know but feel dumb for not knowing. It’s fine- there’s no stupid questions.
AskLemmy is more centered on asking other (lems? Lemians? Lemmers? I have no idea what we call each other.) questions specifically. A question for asklemmy would be something like, “How do you all feel about x?” It’s more of a general question and answer forum where the question is sometimes less important than the discussion that it causes.