Goodreads Shelves — How do you use them?

I recently (read as: today) delved into the world of Goodreads Shelves. Of course, I regularly use my read/to-read/currently reading shelves, but I’ve never branched out further than that. Today, at the behest of Goodreads itself, I made a “favorites” shelf. Then I decided to make a “to re-read” shelf too! My next big project will likely be a “owned but unread” shelf, to keep track of the books in my physical TBR pile/shelf/I’m really not organized enough to keep them all in one place.

So how about the rest of you? How do you use your Goodreads shelves? How many do they have, how do you decide what goes where? I love organization, so any ideas and suggestions you all have would be welcome!