1. You have to be an extrovert and have a lot of lip: the important thing for a salesperson is to know how to reach customers, and for that you don't have to have an overwhelming lip.
2. Everyone can be a good seller: this is true, but you must be motivated not to give up before getting results.
3. Great sellers are good sales managers: to be a sales manager you have to know how to manage commercial teams, which is independent of being a salesperson.
4. A good seller sells anything: not exactly. A seller does not get what he wants if he does not believe in what he sells.
5. The best seller in the world is able to close a sale very quickly: there are customers who need time to buy. There is no pressure but no time left for them to change their minds.