If you go to class, you can read Li Yongle's books. If it is self-study, I suggest reading the textbook first and doing every chapter. One year is enough. My classmate started from scratch, only three months. However, our learning methods are different. I read the secretary's good concept theorem first. He directly read Li Yongle's book, but I also read it all first, and didn't do the problem. Then I watched it again. Go back and do it again. In short, you must read all the knowledge points before doing this problem. Li Yongle's books are comprehensive, so you may not understand them if you read them directly. I suggest reading a book first.