As my.SketchUp is still in beta, there is only one category to raise/document issues: my.sketchup which is where this conversation is happening!
If you want to be a bit more specific in your posts, then you can tag posts with keywords as you make your initial post. Useful keywords include:
As you are composing your post beginning a conversation, SketchUp will (I think) suggest tags that have already been used in this category when you first click in the “Tag” field. I encourage you to try to use tags that have been used before, but if none come close, feel free to create a new one!