I’ve never read any of the source material, but I did skim through the plots of all 8 main books on Wikipedia, and also watched the previous adaptations from 1984 (including the 1988 extended cut) and 2000 (including the sequel from 2003).
That said, this new 2021/2024 two-parter version blows all of those out of the water. Some of the best cinema ever, as far as I’m concerned. A lot of changes made from the book, but they’re all for the best. If you want to see a book-accurate version though, check out the 2000 miniseries. It looks like shit and the acting is terrible, but it’s the most accurate adaptation. Avoid the Lynch version (either cut) unless you like Lynch.
If you don’t care about book-accuracy though and just want a good movie, then just stick to this new stuff. I’m personally really excited about the adaptation of the next book, Dune Messiah. Not sure how they’re gonna adapt anything after that, though (if they even do). The books get REALLY weird after Messiah. There’s also a prequel show about the origin of the Bene Gesirit sisterhood coming out later this year. Looking forward to that too!