Recently I was having a chat with a friend of mine. He is working as a dental technician and has limited knowledge of Internet technologies. He asked me a question that made me wonder.

Friend: What do you do for a living?
Me: I'm a professional web developer, and I build websites.
Friend: Can I learn to code?
Me: Everybody could, I guess.
Friend: And what makes you a professional?

I didn't know what to tell him. After a few days, I still don't know the real answer.

How would you answer this question?