faq stands for frequently asked questions. you put up the most frequently asked questions in the main body of the post. if you're going to answer questions in the comments, there's no reason to add it all to the faq, otherwise you can potentially wind up with a monster of an faq page that may just break the character count.

if you can't be bothered to go through the comments to see if something close to your question's been asked already, just own that it's on you because you're lazy and not on the game because they're not cramming one-off questions in what is likely an already large faq post.