It is better to read the textbook first. After all, the textbook is the basis of all learning, which contains all the knowledge points of learning. Only by reading textbooks can we master the basic knowledge. Judging from the real mathematical problems in recent years, the questioners pay more and more attention to the proof of returning to textbook knowledge and related theorems. As experienced people, they feel deeply, so they think that if they want to learn mathematics well, they have to lay a good foundation for textbooks and don't have to spend too much time on those strange problems in their usual study. The review book is also a good reference book, which contains many summaries of learning methods. . .

Mathematics learning is really a big difficulty, so we must make full use of these reference materials. I have also answered many students' questions about math learning in Baidu. If you are interested, you can have a look. I hope it will help you. . .