I’ve read the entire Hyperion, Dune, and Foundation series. All are outstanding IMO. Dune’s weakest book is Messiah, but it rebounds quite well with Children of Dune and God Emperor of Dune.
Hyperion is just flat out fantastic from beginning to end. The same goes for the Foundation series EXCEPT the prequel books. I found them a bit less entertaining.
I’ve also read Hail Mary. It was simply a fun read. Love it all. Can’t wait to see the movie.
I have the Three Body Problem book but I haven’t cracked it yet. I want to read it before seeing the series.
And of course there is the Hitchhikers Guide to the Galaxy. Always a great series. I always recommend it to folks that are new to reading SciFi.