It means that a person can do everything at home, which is perfect; In work and interpersonal communication, I can be independent and handle it tactfully. That is, it can be both inside and outside the Lord.

it is often used to describe women.

Three Obediences and Four Virtues: it is a kind of moral standard for women in ancient China, and it is a standard requirement for women's moral, behavior and self-cultivation in their whole lives by Confucian ethics according to the principles of "distinguishing between inside and outside" and "men are superior to women".

source: Baidu encyclopedia? I got a link to the kitchen webpage under the hall.