before the fad of the Rings of Power series, my favorite book was The Silmarillion, but just to diversify there is a book that I heartily recommend to any human being regardless of age, gender, ethnicity, religion and the like: Patch Adams, is a very good book and movie too.
This is that kind of book that marks something in you forever, I say without exaggeration.
Blood Medirian by Cormac McCarthy, nothing comes even close when it comes to books.. This was also written inspired by real life events, everyone should give it a shot.