Apparently you can’t create a private shelf on Goodreads; in fact, their “workaround” is to create an entire private group just for yourself and use its shelves for this. As I investigate the degree to which I can wean myself off of Amazon (yes, I know Goodreads is owed by them), I’m trying to find a replacement for the private wishlist of books I’m thinking about but haven’t decided on, and I guess Goodreads can’t help me with that unless I want to jump through all the group-creation nonsense.