I've only seen half of it, so I can't write a perfect review, but I'm so grateful that I'm leaving this review first. Originally, I studied in a cycle from HTML - CSS - JS - Node - Express - DB in Livingxx for about 3 months. And then I started looking for books on job support and intermediate JavaScript. Then I realized that I was still at the level of 'understanding' the basic grammar of JavaScript. I was quite frustrated, thinking, "I still don't know the basics.." Do I have no talent? I was about to give up, when I happened to watch Zerocho's lecture. As I learned while making many games, I definitely feel like the concepts that I had only understood to some extent are now mine. If you are learning from Lifexx and are getting started with coding, and were able to have a general context and a narrow perspective, then in Zerocho's lecture, I feel like I am learning how to cook as a chef. "Isn't there anyone who can teach me like a close friend, brother, or younger sibling?" "Why aren't my coding skills improving?" "I know it, but why can't I use it?" I think this will be a really good lecture for those who ask. Oh, one thing I regret is that I had a lot of trouble deciding which lecture to take between the ES6 2020 lecture on YouTube and this lecture, so it would be better if you clearly stated this point.