My opinion is that it can be written in two parts. The first part is the explanation of the knowledge points in the book. For example, if your teacher is used to writing blackboard books, you can list them in your notebook. Some people may find it unnecessary to write it down and waste time. This is wrong. The format of the teacher's blackboard writing is mostly a high summary of the contents in the book. When they prepare lessons before class, they actually think about what is useful and what is useless, and record the most essential parts. I am in high school. Simply writing down the teacher's blackboard is very helpful for future exams. It will make you remember and review the most important things back and forth in the shortest time, so don't bother too much, and you should also record while listening, or concentrate on the class. If there are few blackboard books or no overall outline, you need to listen carefully and listen to what the teacher says in class. Generally, you will explain the concepts, principles and confusing things in the book, which you need to sort out and summarize after class or in class. The second part is practice. After finishing a knowledge point, the teacher always gives some small exercises to deepen the students' impression. When you do these exercises in class, you will always encounter problems that you can't do or are easy to make mistakes. This requires you to simply write down these questions, write down the answers first, and then turn them out after class or before the exam. In fact, handouts are ordinary notes. You don't need to think about how to typeset and write. You just need to record the mistakes you don't understand in class, so as to prepare for future review.