it would be beneficial for people who want to start entering books into bookbrainz to have a book present that is entered correctly and can serve as a reference until proper style guides are in place. (for comparison, there exists the "gnu hello" program that does almost nothing but serves as an example for how it's done, and is packaged in debian as an example of what a minimal package looks like).

such a book should have at least two editions, and having translations would be beneficial as well, if that's already covered by what can be entered. it should be linked as an example in the "Join Us!" section (eg. "To get an impression of what data can be entered about a book, which entities are involved and what different editions of it look like, read about 'The Hobbit').