The product manager is to make a thing according to the idea given to you by your leader, and you conceive the details of this product. For example, if your leader wants to sell jiaozi, he will tell you what kind of jiaozi he wants, who needs to eat this jiaozi, and what feelings it can bring to users. For example, the boss needs this jiaozi to let customers find the feeling of first love. You start to think about what your jiaozi looks like according to your boss's requirements, and then draw a prototype, the shape of jiaozi, the trap of jiaozi, and jiaozi's way of eating, and give it to the UI for design, so that he can decide how to make jiaozi look good, and then you give it to the developer, so that they can find ways to trap and wrap the materials you need.