How to make children develop the good habit of being polite and self-effacing?

Let children develop the good habit of being polite and self-effacing. First of all, parents, as the first teachers, should lead by example, and lead by example in everything, so that children can form habits in a subtle way. Secondly, after the child remembers, take him to participate in public welfare activities, so that he can gradually develop a grateful heart and a spirit of helping the poor. Third, guide children to read China's traditional bibliography, so that politeness and modesty can be rooted in their minds. Fourth, whenever children are friendly to others, they should get along with their elders and children politely and humbly, help the weak when they are young, or give up their seats on the bus. Should be praised or rewarded in time to create a family environment atmosphere for the formation of good habits. I believe a polite and humble boy will grow up!