BookWyrm is the Fediverse's alternative to Amazon's Goodreads. You can find out more about it at https://fedi.tips/bookwyrm-a-social-network-for-people-who-enjoy-reading
BookWyrm has a built-in catalogue of books to search, but if the book you want isn't in the results you can optionally add it manually. More info about doing this at https://fedi.tips/how-to-manually-add-a-book-on-bookwyrm