Also, while not exactly a “questions and answers” website, Reddit is also a good choice to post Q&A type content. I’m still a member there myself. Haven’t been there in a while though.
ask.metafilter.com is how I learned of this place. Note that they are very strict. It is five bucks and your questions need to have a actual answer or they will be nuked as chatfilter.
99% of the questions asked here would not be allowed on Metafilter.