Overpass API and query language is great and flexible tool for search in OpenStreetMap database! But seems Overpass miss his own public place for ask questions and search answers to already asked popular questions - as I research, it have only Wiki.
I can’t tell the exact number, but think that in near future community will fill this section with useful content, because many have questions, related to overpass, and can’t find in Google any right place do ask and discuss them. So let’s do this place in OpenStreetMap forum for those people!