Simply put, it is posing. . . However, you have to be skilled, cultured and level. Of course, you have to be influenced by animation theory. You have to watch many famous movies and TV dramas at home and abroad, learn from other people's shots and their plot settings. . . Animation is a comprehensive art after all. In addition, animation is for people to see, so the script is the soul of animation. Technically, it's just reading some books and teaching yourself.
You like it, of course, it's best to take an animation major, but the animation major in most schools is very poor. . . As far as I know, there should be no special stop-motion animation major. Stop-motion animation is now a course for animation majors. . .