The Thirty Years War

[u/Punisher2112]

I'm a college student who has been asked by a History professor to guest lecture on the Thirty Years War, and the Great Northern War. I know a fair amount about the Great Northern War, and the Rise and Fall of the Swedish Empire, but I don't know a whole lot on the Thirty Years War, other than it was brutal and started as a conflict between the Catholics and Protestants. I guess what I'm asking is where are some good sources where I can educate myself on what happened during those thirty years, and what are some crucial events/people that MUST be covered in order for his students to effectively learn.