The main part includes employees' understanding of their job responsibilities, skills and values.
Responsibilities of your own post: what this post mainly does, how to do it, and what purpose this post is set up for.
Skills: What skills are needed for this position, such as calculation ability, drawing ability, translation ability and so on.
Value: What kind of value do you want to create in this position, whether to satisfy customers, increase the company's income, or make the company run normally, etc.