In 2020, the thing that helped me the most in the development field and helped me grow the most was coming across your lectures. When I first started the series of lectures, I started with the level of understanding that I could just roughly get the source code from the internet and modify it a little to use it on the screen quickly. Even before this lecture, I tried numerous frameworks and libraries such as React.js and Node.js, and I literally just followed them one by one without any fundamental understanding of why they were done this way. However, I thought that doing this was meaningless, and I desperately wanted to build up the basics of JS first, so I considered various lectures and books. I also happened to choose the lectures by chance. It was a bit boring and difficult at first. However, I gradually started to adapt to the lectures, and as I started taking the lectures repeatedly, the concepts were organized one by one. By following the lectures and developing the habit of debugging, I was able to understand the code on my own, even when I started without knowing anything about scope, prototype, __proto__, hoisting, closure, this, etc. I have finished 3 out of 4 lectures in the series and am currently taking the last lecture. When I don't remember what I studied before, I look back at the lectures and organize the content to use what I have learned now, so I am working on a study and personal project. Thank you!