I recently bought this book: https://www.amazon.com/Introduction-Elementary-Particle-Physics-Alessandro/dp/1107050405/ In the preface it says that I'm assumed to have already learned quantum mechanics (including angular momentum and Dirac equation) and nuclear physics at an introductory level. What does that mean? Do they mean like a sophomore introductory modern physics course? If so, can I just read and do problems from books like University Physics with Modern Physics (Young and Freedman) or Modern Physics (Kenneth Krane)? Would that give me sufficient knowledge? Thanks.