I think it’s also a good idea to get involved with bad books for a while. If you happen to pick up an unfortunately shitty book on a topic you’re interested, you don’t have to chuck it away immediately. Dissecting it on why it’s bad can help you further your knowledge on the topic. I guess what I’m saying is that bad books can challenge you. It can shake the knowledge you’ve built with other good books, but you don’t have to let these bad books devalue what you’ve learned from the good books.
There are bad books (unoriginal, run off the mill non fiction) , those we have to avoid. But there are also bad books (of different approach / opposing beliefs) that can open a reader up to things they haven’t previously considered and that’s what we should be careful of chucking out.