How should a wine salesman work?

I only run restaurants; Every week, there are different wine salesmen to promote their company's drinks; I also worked as a salesman; But it's not about the wine. But I know there are two main types of wine salesmen; One is to promote drinks in shopping malls or supermarkets; One is to bring drinks with the car and wear them directly to discuss the difference with hotel owners or hotel managers of all sizes; And the smell of wine and so on. Work hard; But it is very challenging; If you are young; You can have a try; Because business can improve people's communicative competence and language proficiency.