Is the pocketbase codebase good to learn from?

TLDR: Learning backend in go, is pocketbase a good codebase to reference/learn form? Any other recommendations?

I've mostly done toy projects with go mostly without guidance, but an opportunity has come up and I need to build a site with a proper backend. I've liked working with pocketbase before since the extendability is honestly really great, but I also realised I have no idea about API and backend work when I did those small projects. Is this a good codebase to read (idiomatic I guess?) and learn from? What projects or books do you recommend to get a proper look into backend?