I'm sure I'll feel confused. I suggest you hire a math tutor. Of course, the other party should be very capable and know fairly well. So he can teach you in a measured way. It is not recommended to find math courseware or videos online, because it is easy to ignore the key points of learning and it is not easy to concentrate. One-on-one guidance is definitely the best choice. It's very important to do the problem. Things in theory often seem to be understood, but in fact they are very confused. Do more questions and you will understand the meaning. The sentence "Without it, it will never change" is absolutely not applicable to mathematics. Explore the questions by yourself first, and then combine the answers. But if time is not enough, then lay a good foundation first. Many times, instead of spending a long time on a difficult problem, it is better to regard it as a basic problem, and the results are much worse. This thing can weigh itself. Anyway, good luck and hope to help you ~