These books give me the impression that there are many examples in a textbook, but different people have different views when encountering new problems. I don't know whether you use software or real methods. I suggest looking for qualified experts to find software, which is too dull. I still think I have read it. Without years of practical experience and book theory, it is still difficult to study a character.
Why don't you drop Tianmu /p/72925 1663? You can have a look.