It is recommended to read Li Yongle's lecture on line generation. There is a nickname Wang on the online generation. I wonder if he has heard of it. His line generation is recognized as the first in the postgraduate entrance examination. It is suggested to have a good look at the knowledge structure in front of each chapter. It will be clearer after reading it. The most troublesome thing about line generation is that there are many probabilities, miscellaneous, and big connections before and after. The knowledge structure must be straightened out, and it is best to watch Li Yongle's video together. I'd better wish you good grades in the exam.