I have a boatload of favorite books (mostly from back in the days when I had more of an attention span to read) so I’ll just name a few:
The Dead Girl by Melanie Thernstrom - I bought this book decades ago at Kmart expecting it to be a true crime nonfiction book. it ended up being much more than that, and a life-changing book for me. I understand the murder victim’s family was upset about the author, who was the victim’s best friend, writing the book, which is a shame because it is such a good and deep book about death, crime, relationships, being a young woman in college in the 80s, and other things.
Seven Days in May by Fletcher Knebel and Charles W. Bailey II - The movie version of this book is excellent too, but I actually read the book a long time before I saw the movie. I was on the edge of my seat through the whole last third part.
The Electric Kool-Aid Acid Test by Tom Wolfe - I read this as a teenager and thought the writing style was amazing and it contained a lot of useful life lessons too.
Encyclopedia of Rock by Logan and Woffinden (1st edition) - First edition of this was fantastic, I learned so much and it was a time capsule of the pre-New Wave era of 70s rock, especially British bands, which were somewhat hard to learn about in the USA then. Later editions started removing old bands to put in new bands and in general just got worse and worse. I never recommend any edition of any rock encyclopedia or rock history past the first one, for that reason (the Rolling Stone History of Rock n’ Roll had the same problem).
At Wit’s End by Erma Bombeck, and several of her subsequent books - Her stuff is getting a little outdated now but was very funny and true when written and some of it still applies today. I can still remember and in some cases quote verbatim sections of her first few books.
And Ladies of the Club by Helen Hooven Santmyer - Huge fat historical novel set in Ohio and written by an author in her 80s. It’s a huge book and covers an era of US history (post-Civil War to just after WWI) that is generally overlooked by authors. As a history buff who grew up in Ohio, I found it fascinating and I always wonder why it was never made into a miniseries as it has plenty of drama.
I could go on and on but that’s probably enough.