This is a great lecture that I wonder if it is possible for me to listen to such a well-organized lecture that must have been realized through years of experience. For me, who had been developing new requirements by copying and pasting existing sources, this is a very thankful lecture that made me realize for the first time, "Oh, this is why this is used, so if I do this like this, it will happen like this." Thanks to this, development has become more enjoyable. I sincerely thank you! I will also work hard on the next roadmap!! Thank you, instructor Kim Young-han!