It was a lecture where the instructor's sincerity was clearly evident. The content of the Siko site changed in the middle, so there was a bit of a crisis...but I was able to finish it with the code that the instructor uploaded as a coach with a good sense of humor.... First, I tried to follow the instructor's coding line by line as much as possible. Since I just copy and paste the coding, it only works for a short time... In the process, I would miss a small point and have problems, and there were times when I would struggle, wondering why an error occurred, but it was a valuable time for me... First, since I listened to it once, I will now listen to the necessary parts again by selecting and focusing. Thank you...