2. It is recommended to find a teacher. The probability of fame is too small, even if it is just to find a teacher to enter the door. Now I feel it is very troublesome to find a teacher. When I toss up all kinds of problems and then ask the teacher to correct them, I will find self-study more troublesome. Not to mention whether you can find a systematic teaching video, even if you can, the video can't answer your doubts at any time. After all, everyone's ability to understand and accept is different. In the same teaching process, different students will have different problems.
Find someone knowledgeable around you first, and he will give you a reference.