Honestly it doesn't matter much, go grab a random book from goodwill. If you do "need" a recommendation, I'd suggest "Roots", I'm reading it now and it's amazingly well written.
One suggestion I would make is to read something from before 1980. No real reason why, but books from 1900 - 1980 work better for me personally, not sure why.
It's difficult to recommend things without knowing a reader's taste, but I blanket recommend The Stars My Destination, by Alfred Bester.
https://en.wikipedia.org/wiki/The_Stars_My_Destination
I saw this recommended by the Bookpilled youtube channel, I just ordered it. \(^-^)/
I just read this! Also recommend.
Rabbit, Run by John Updike
Theft of Fire is my favorite book in the last ten years for sure.
https://devoneriksen.com/products/theft-of-fire-orbital-spac...
What counts as a good book varies from person to person.
But take a look at anything by Asimov. I have a collection of his short stories and it is a nice read. Oh, and any short story collection by Chekhov.
If you can stomach older English novels: A Tale of Two Cities by Charles Dickens
How about an Elmore Leonard novel? Very digestible novels from a deceptively skilled craftsman.
Honestly it doesn't matter much, go grab a random book from goodwill. If you do "need" a recommendation, I'd suggest "Roots", I'm reading it now and it's amazingly well written.
One suggestion I would make is to read something from before 1980. No real reason why, but books from 1900 - 1980 work better for me personally, not sure why.
Fiction or non-fiction?