I feel that I can't write many questions in the postgraduate mathematics, and I have no clue. I can only look at the analysis. After reading it, I feel that I have forgotten it for a while, so I am very entangled. What should I do? After repeated practice, I finally became a family. Understanding is based on memory. I am similar to you, and I can understand it, but I don't know how to do it when I do it myself. Why? The reason is that you are not familiar with formulas, theorems and steps, and you must practice them repeatedly. Practice makes perfect.