Get Rich Quick: Become a Teacher – Slate Magazine

Victor Bastos was making $20,000 a year as a freelance Web developer in Lisbon, Portugal, when he started posting videos to YouTube. Already fluent in several programming languages and looking to branch into new ones, he thought making instructional videos would help him keep track of what he’d learned. “It was like an online notebook for myself,” Bastos, 33, told me. “But then I started getting a lot of subscriptions. People told me, ‘Your tutorials are great—why don’t you make a full course?’ ”