He knows exactly what parts are confusing for people who are not familiar with JavaScript and gives clear conclusions. Arrow function - Part 2, this binding << I was really impressed when he explained the upper scope of the method defined as an arrow function in an object in this lecture. It was always a confusing part for me, but he gave a clear answer on where to see the upper scope, so it feels like the instructor scratched the itch that I couldn't scratch. It's really the best. If you know JavaScript vaguely, be sure to take this lecture.