Example is very important.
Politeness education is not only required for children, but also important for parents to set an example. You can take the initiative to be polite to others, such as greeting the teacher and saying goodbye, so that children can see your behavior and imitate it.
Appropriate punishment
You need to make appropriate punishment for the problem of children hitting people. For example, if a child hits someone, you can temporarily confiscate his favorite toys to make him realize that his behavior is unacceptable.
neglect
When a child cries, you can choose to ignore it. This will make the child realize that crying can't achieve his goal, and slowly he will learn to express his emotions and needs in other ways.