Need a complete set of introductory tutorials for high-scoring painting.

I suggest you go to a good art training class. Art technology is different from computer technology. The former pays attention to artistic accomplishment, while the latter pays attention to operational memory. The concept of sketch is very big, and the objects it depicts include many series; What to learn first, then what to learn, to what extent to learn before entering the next link, what are your advantages and disadvantages, what is the focus, and so on. Besides, sketch learning takes at least one or two years, and these so-called comprehensive courses can't solve these specific situations. No matter how smart you are, it's not worth wasting some time (I drew this one to show you).