If you want to learn English, you may have come across one of Gabby Wallace's hundreds of YouTube videos on the subject. Her channel, which started only because the video she recorded for her classroom students was too big to email, has grown to more than 170,000 subscribers and nearly 9 million views. Gabby is a long-time teacher and found a way to turn her subject matter expertise into a business.Full Show Notes and PDF Highlight Reel: YouTube Marketing: How to Use Free Videos to Build a Full-Time Online Business