Really great to see you on this topic, @Liza. Thanks for posting here and giving us some reassurance. :)
As for categories, you could do something like this (inspired by the Scratch forums):
-Announcements from THT
-Help with Code
-Contests and Challenges
-Questions about Hopscotch
You add an off-topic one perhaps, or one for stuff for other topics like drawings, technology, and creativity.