What does it mean to understand morals and know manners?

Ming De Zhi Li means to understand morality and know the manners.

The Tao is the source of all things and all laws, the power that creates everything; virtue is the practice of doing things in order to comply with the objective needs of nature, society and mankind, not to violate the laws of natural development, to develop nature, society and to improve their own way of practicing.

Etiquette is the rules of etiquette for people to interact with each other. Etiquette is the virtue of not getting in the way of others, but also their own passport to do all things, etiquette is a variety of forms of people to show respect for people, including the form of action and language forms. For example, shaking hands, bowing, kowtowing, etc., is the form of action, greetings, thank you, etc., is the form of language.