a title is a very important part of your seo advantage over your competitors
generally, you want to have a title that specifically targets a certain type of audience
the more competition there is for the keyword(s) youre trying to rank for, the longer the keyword should be
the reason is because the longer the keyword, generally, the less the competition
as for whether or not the title should contain a question mark or not, that depends on the content and the audience youre targeting