1 skim a book first, think about what you don't understand, and then continue to read a lot of context patiently, and you will gain something.

You can't understand without careful understanding. I can consult relevant people. I recommend myself. Often watching historical video wars or stories of a certain period of time is very interesting and can make people deeply understand and remember.

It is the most convenient and quick to close the book and think quietly.

It's just a personal feeling I hope I can give you some inspiration ~