I want to ask: Is it beneficial or harmful for a very strict and fierce teacher to clap a child's palm?

Harmful! For children, the heart is inherently fragile, the sense of self-protection is not strong, and self-psychological counseling will not be carried out. The teacher is so strict and always hits the child, which will cause fear and even bring a shadow to the child. What's more, beating or sheer severity can't play a fundamental role in children's education. Maybe the children at that time would be obedient because they didn't want to be beaten and scolded, but they haven't fundamentally changed their shortcomings. Educating children is mainly from the heart, so that children can truly realize what is right, what is wrong, and what can and cannot be done! If you hit your child easily, the child will think that obedience is just to avoid being beaten. If there is no supervision, as long as it will not be discovered, you can still do what you want. I suggest teachers reflect on themselves!