Think about something you're passionate about. Or were passionate about when you were in high school. Write it down.
Programming.
Then apply this test: Will people pay you for it? Will they pay you a lot for it?
YES.
Okay, perhaps this post is not for me, but the post comes across as highly anecdotal. E.g:
That advice has probably resulted in more failed businesses than all the recessions combined...
I hate to ask it, but source?