OK, since I have humiliated myself by admitting my slightly below average (with a few exceptions) appreciation of fantasy in general and some well known looong series in particular, here are a few thing I like to read.
1. Everything of substance in mathematics and physics.
2. Horror stories.
3. Science fiction.
4. Weird stuff.
Favourite math and physics books: "Ordinary Differential Equations" by Kenneth Howell and "The Road to Reality" by Roger Penrose (Yes, the Roger Penrose).
Favourite horror author is Peter Straub. First came upon him when buying his "Ghost Story" because I was going to Belgium and had forgot to bring along things to read (this was before my Kindle days). As said in my post above, he has written two books with mr King: "Talisman" and "Black House". Recommended. Other recommended works: "Shadowland","Floating Dragon" and especially "Mr X". He has also written a series of crime novels with a twist, well worth reading: "Koko", "Mystery", "The Throat".
Favourite Sci-Fi writers: David Brin, especially his 2 "Uplift" trilogies. And Ursula Le Guin (the Hainish book cycle). And China MieVille ("Perdido Street Station" is an excellent piece of work). And many others. Among the newer things I've read I recommend the "Broken Earth" trilogy by N. K. Jemisin (very original, Hugo Award winner), and the Murderbot Stories by Matha Wells.
In the weird stuff category I'll mention only one book: "Special Topics in Calamity Physics" by Marisha Pessl. It's not everybody's cup of tea. I think it's safe to say that if you don't like it after 5-10 pages, it's not for you. But if you like it, you're really gonna like it. Unless I'm wrong.
pibbuR who would recommend more books if he could remember them.