Feel free to come back if you want to talk about Popper more. His work can be quite difficult to read. Some paragraphs/chapters read smoothly, then others are very technical. It might be worth having a quick look into ‘hypothetical deductive methodology’ for an overview of Popper’s main idea before tackling him directly.
It might also help to know that his theory comes from his anti-communism. So when he’s talking about the problems of prediction and historicism, he’s challenging the Marxist method (poorly, IMO, but I won’t get into why, here, unless you want to talk about it).