My dear friend, you are very modest. Let me talk about my own thoughts: I think that in mathematics, teachers should be as simple as possible so that 90% of students can understand, but only let them understand and remember the most basic formulas and concepts in class. As for those deep-seated problems, I will not talk about them for the time being. When I talk about homework and exercise books, I hope you can also talk about them. At the same time, I am infiltrating some in-depth questions that I have long wanted to talk about, so that students can master them quickly and listen carefully. Because homework and exercise books are definitely more difficult than you said, and they have already done one side when you spoke. Although they didn't do it, they thought about it, which can get twice the result with half the effort. Besides, when you speak, they are psychologically hopeful and will definitely listen carefully.

This is just a little experience when my silly brother studied mathematics.