I wasted my youth not reading this beautiful series by Ursula K. LeGuin and I thought it deserved to be the first post here. Having read so much fantasy over the years, I can see so much of it in the books that have come out more recently. It’s the type of book that is written so that every single word has a purpose, and doesn’t languish in one place or another. I highly recommend the audiobook version as well.
Also read them for the first time as an adult. The first book didn’t do a ton for me, but I loved Tombs of Atuan and Tales from Earthsea