The first Harry Potter book is my most reread book by far. I got into the series when 4 came out and always reread the series before I read the new book that was coming out. Now I just listen to the Audiobooks occasionally.

LOTR I’ve read twice, but I read Fellowship and the Hobbit more than twice.

I’ve reread a few John Grisham books (the Firm, The Pelican Brief, The King of Torts).

I reread The Christmas Carol last year and almost read it again this year.

I don’t read that many books, maybe 10-15 a year, but I like rereading them. I’m still reading the Sherlock Holmes series now and I’ll definitely reread some of them in a few years.

I think it can be good. It can be lore or history of the world within the book, or just a story that has similar themes to the book and the character can learn them.

The only full story that I think I read, within a book, was in Phantates. The MC was in a castle and spent his days in the library. One chapter is almost entirely just one story about a woman stuck inside a old mirror that a man bought at a shop. He tries to make her happy by cleaning his room and buying nicer furniture but she’s still sad. It’s kind of a love story in a fantasy world, like the book itself.