what kind of behaviour is this when angry and cries a lot and hits to wall or hits himself

A. Mam this is a very common behaviour with kids they actually are becoming stubborn more and more when they want something they just behave like this and a lot of times this is the result of the gentle parenting where initially kids are really pampered by the parents and later they get more stubborn with it and the second other reason could be a lot of screen time because that actually leads to a very strong impact on the brain which is why kids also behaved like this