"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.

Ask the librarian nicely and they'll probably be able to point you in the right direction. Cataloguing information is kind of their thing, and helping people get access to that information is why many of them join the profession.

Ask a librarian.

Just sit at the library for a while, sit near the shelf that has the topic you're interested in and grab a few books at a time and go through them to see if any seem like the right book

I was taught in school how to use the library catalog. It was considered essential, for success in life, at the time.

I actually do know how to use Dewey Decimal, if I haven't forgotten.

In these modern times, there's generally a PC near the information desk, with the browser home page set to a library catalog search tool, specific to that library.

And as someone else mentioned, we can ask the librarian for help, when we don't find what we need. I actually shortcut the process and ask for a quick lesson in how to use the search, if I'm feeling uncertain.