It was great that I was able to build a solid foundation!! Also, I was grateful that you pointed out the mistakes I made while developing. It was really helpful. At first, I thought, "What kind of lecture is this?" because I had to write the code myself. This is not a lecture where you copy and paste the teacher's code, but a lecture where you write the code yourself while listening to the lecture, think about it, and think, so it was more helpful and really great. Thank you so much!!