A lot of the context for this book is actually in the book. Hitler decided to write down his views while in prison (which he was supposed to be in for 5 years, but actually got out in less than a year) and he turned it into a long autobiographical explanation on how he hates Jewish people and how the Aryan Germans were superior to all. He explains how he got all of these viewpoints in his own writing, citing the newspapers he read in his youth.
Uncomfortably, his book is still printed and sold today to a degree that is frankly unsettling. After the war the copyright claim was given to the Bavarian government in an attempt to stop its spread in any way, but regrettably and predicatably, versions and translations still got out. People online for years have passed it around and many people alive still agree with his beliefs, I see a lot of this in America especially, and it’s very disconcerting to see how disconected from reality these people are (because they must be to agree with Hitler – especially this book, which in my opinion calls more to why you shouldn’t trust anything he said, because it is incredibly poorly organized and unnecessarily long winded.)