"Don't you know the Dewey decimal system?"

Sorry, stupid reference. In seriousness though, type in a topic into your library's search and start browsing, check out a few that seem useful.

I'm an academic and I find my University's library useful for finding knowledge on a new topic. If an introductory textbook exists on the subject, can be a good starting point.

For Most hobbies though, youtube is a great resource. I've gotten into woodworking and fishing, and youtube is a superb resource for information.