Sales is often seen as a dirty word, but it's a skill everyone develops throughout their life.
You're always selling something.
You're selling yourself in a job interview.
You're selling your partner on your next vacation.
You're selling that date.
Your ability to sell something comes down to the psychology of persuasion and good language skills.
If you can convince your friends to eat at a restaurant they have never been to, you can probably sell something for money.