I just joined the library near me (Shout out for the incredible Harold Washington Library in Chicago!) and I've realized that It's a great way to test books out from authors I don't know about. It's also great for e books as you can check them out without even going to the library.
I tend to check out more books than I’ll actually read, looking for the ones that really grab me; I read those through to completion. The ones that change me fundamentally, I buy a copy to hold on to.
I did the Marie Kondo discarding thing with books a couple of years back and it opened up a lot of shelf space; it’s very useful for keeping an always rotating stack of books from the library.