I've read them all but it's been years. I want to go back to them. They are great books. Silly, goofy, and weird but very enjoyable. The world of Oz books is surprisingly complicated[1] but I would say the original series penned by Baum is definitely worth checking out.

[1]: https://en.wikipedia.org/wiki/List_of_Oz_books

It also gets pretty macabre in parts. Specifically The Tin-Woodsman of Oz where the title character wonders whatever happened to the girl that was the reason he was cursed. You see, he fell in love with a girl who was enslaved to a witch, so the witch enchanted his axe to chop parts of him off every time he swung it. Eventually, there was nothing left but the tin replacements.

And if that isn't enough, it is established that nothing in Oz ever dies. Including all his chopped off parts...

I love the Oz books growing up. I tried to read the 2nd one The Marvelous Land of Oz to my then young daughter after we'd watched the movie, but Old Mombi turned out to be bit to hard core.

Planning to turn Tip into a statue and the threat of beating him black and blue made it a non-starter.

They're public domain now; a few years ago I made a list of links for reading them on Project Gutenberg and Open Library - https://www.metafilter.com/125680/I-dont-think-were-in-Kansa...

Yes, the later books about ozma and the underground kingdom are fantastic.