I don't know why I seem to be going backwards in my reading. I'm actually writing a kind of Edgar Rice Burroughs Mars-type adventure SF novel and having fun with it; this after years of stuff that people read but rejected because they didn't think there was a market for "literature"--when I thought I was writing light stuff.
One writer some folks haven't heard of who has developed quite a cult following is James H. Schmitz. I've got one of his books--he's kind of like Andre Norton for a more mature audience. I'm trying to immerse myself in this material--GOOD, solid SF adventure. But the modern stuff seems too agenda-driven. I prefer good thoughtful stuff, even if it's "just" an adventure.
Oh, I'm also starting the Foundation books, at last.
Another good book(s) is Magic, Inc. and Waldo..
The original name and concept for "waldo's" ( pantographic remote handling devices ) comes from these books.
"Stranger In a Strange Land" is a favorite, as well as "Starship Trooper", "The Moon is a Harsh Mistress", and....
"Methuselah's Children".. ( I actually prefer this to "Time Enough For Love".. )
I wrote short stories that I have lost, I wish I would have submitted them to SF magazines.