This is not my first time taking a Cote online lecture, but the second time I've taken a lecture from Bigdol. In fact, the first lecture was almost neglected and not uploaded. On the other hand, in the case of Bigdol's lecture, he uploaded everything diligently, and the fact that he updated the lecture by receiving feedback from students showed that he was sincere about providing a Cote lecture for students. I haven't finished it yet, but I think I will find myself changing when I finish it. Thank you for carefully reviewing and informing me of the answers to my questions. The lecture difficulty was said to be beginner level, but I felt that it was intermediate or higher. However, if I master this beginner level lecture, I am satisfied because I am guaranteed to improve not only my CPP knowledge but also my implementation skills. Thank you for uploading such a good lecture.