It's hard to give specific advice on which book to read when you want to understand philosophy, because philosophy is a very broad field that involves a lot of problems and topics. However, if one was interested in Being and Time, then this book was one of the classics in the field of philosophy. Its theme is about the fundamental problems of existence and time, including metaphysics, cognition, ethics and aesthetics. This book was rich in content, allowing readers to have a deeper understanding of philosophical issues.