Generally speaking, I have been there a few years ago, but I haven't received any training. Later, I taught myself. If I have no foundation and want to learn, I can learn if the economy permits. It is impossible to learn all the skills in the training class. There must be an advertisement. I believe I can do it at most. What a month or two of training is equivalent to several years of experience, what's more, becoming a master training school is all bragging. When I get there, I just learn some basics, but the most important thing is to rely on myself.