Thank you for letting me listen for free. It was very helpful for me to learn the basic grammar of JavaScript. In particular, the parts that explain the CS knowledge necessary to understand the concept using Keynote, and the practical code examples were very helpful for understanding the concept. (For example, the prototype lecture👍🏻) I recommend this lecture to those who want to quickly learn the basic grammar of JavaScript, or those who have a rough idea of the basic concept but want to learn it properly. It is a very good lecture among the free lectures.