First, their own pain points, such as: what to do if they don't take orders in the early stage, what to do if they don't get secondary sales in the later stage, how to manage the technical department, and so on. The second is how to buy points from other people's homes, such as how to take orders, how to maintain old customers, how to introduce them and so on. Third, what do you care about. That is to say, it involves some practical problems I encountered in my work.