Since I majored in liberal arts, many things like vector inner products were unfamiliar to me ㅠㅠㅠ In order to fully understand, I also studied additional subjects at the same time And implemented all the practice problems So I studied the 5-hour lecture for almost a month or two ㅠㅠ Thanks to this lecture, I gained a lot. I also gained some confidence in my C++ skills I'm really glad I finished it!