A lecture that is as deep as a book, but easier than a book! When I first approached JavaScript through a book, the content was vast... and the writing was too difficult... In actual practice, since I used jQuery, I just passed over the parts that I had to deal with conceptually in JavaScript. If I look up the contents of this lecture in a book, it's so difficult...ㅠㅠ Thank you for explaining it so easily. Introductory lectures usually focus on the technical part (how to write), but Jaenam's lecture covers the concepts, so it seems to be very helpful. This lecture is better if you repeat it once when you're confused or forgetting.