I usually write about where I bought this book on a certain day and month, my recent mood, what I expect from this book, and so on. After reading it, I will also write down my feelings after reading this book one day. If you read this book again after many years, you can compare whether the feelings at this time are consistent with those at that time, what is the difference, why the difference is so big, whether it is the difference in life experience or the deeper understanding of the stories in the book, and so on.