(A good salesman must be able to face different customers, and the content of small talk to build trust must be different. This requires you to have the ability to learn quickly, expand your cognitive boundaries, and improve the relationship between knowledge and knowledge. Deep connection. Knowing how to sell is not only needed by the business, but also in personal life and work. Selling is more than just selling stuff. Successful selling is not just about finding a need, it's about matching the need with the best solution, which is sustainable.)