There are many good books on philosophy that you can refer to some of the more popular works: 1 Sophie's World-Jostan Judd This is a classic introductory book on philosophy. It narrates the main schools of thought in the history of western philosophy and the stories of important philosophers in the form of stories, so that readers can better understand the nature and significance of philosophy. 2 Being and Time-Martin Heidegger This book was one of the classics of 20th century philosophy. It explored the nature of existence and the way humans existed. It proposed the concept of "existence is an event", which had profound implications for understanding the nature of human existence and the world. 3. Nietzsche's Philosophy (Philosopher Psychologist Antichlist)-Walter Kaufmann This book is an in-depth analysis of Nietzsche's philosophy. It covers Nietzsche's thoughts, cultural and social background, as well as his understanding of human nature. It plays an important role in understanding modern philosophy and thought. 4. The rational animal-Stuart Latchling This book explored the nature and differences between humans and animals from the perspective of biology and philosophy. It proposed the concept of "humans are rational animals", which had profound implications for understanding human behavior and thinking. 5. Basic questions of ethics by Jean-Jacques Russell This book is a classic work on ethics. It covers the nature and significance of morality and moral principles, and puts forward the concept of "morality is free." It has important implications for understanding the nature of morality and ethics.