I've heard the book is very incoherent and just basically the ravings of an anti-semite, but does the book offer any significant insight into the man that wrote it?
I ask because I believe when you humanize a monsters you realize that they weren't some such rarity, but shows you how close and easily society can descend into chaos and "evil".
This topic has been addressed a few times on this sub, including u/commiespaceinvader's excellent Monday Methods post on Mein Kampf's value (or lack thereof) as a historical source
u/Georgy_K_Zhukov also has had this to say:
To be clear, Mein Kampf is a primary source document that one must eventually engage with when studying Hitler, but it really is not your first stop, nor your second or third stop. It is more your very optional 15th stop after you've read a really solid biography or two (Ian Kershaw's duology is a good one to pick up), some general histories of the Third Reich (Richard Evans' trilogy is the 'go to' recommendation), and some more specialized works that really dig into the the topic of Nazism, like Tooze's "Wages of Destruction" or perhaps Rees' "The Holocaust".