Sales psychology in the workplace: Why talk to customers so much, but the effect is not good?

Maybe I said too much. I felt this way before I bought something. The salesman kept talking, but I was actually disgusted. Therefore, it is suggested that salespeople should learn to look at customers' expressions. After introducing the basic situation, customers can talk more and ask more questions so as to have further communication. Of course, this is just my feeling as a customer. Everyone's idea is different, and it varies from person to person.