When children are young, other senses are not perfect. He needs to feel the world with his touch, which is generally reflected in touching this and knocking that. And play is the best medium for children to learn.
Parents, as companions, are the providers of the minimum needs (physiology, safety and love) in children's psychological growth. Only by meeting these needs can children improve their self-realization needs and become better people. In addition, it is right that children are underage and need to be accompanied by guardians.