It was good because it clearly distinguished between the parts to understand and memorize, and there was a focus on the core and practice was possible with various examples. I was worried that it would be lacking in depth since there were only the core parts, but it was refreshing to use the clang compiler, and the lecture included parts that I didn't understand and simply memorized, and parts that I was confused about and misunderstood, so I think my understanding of the C language has definitely improved, so I'm very satisfied. If there had been a lecture like this when I first started learning the C language... I completely trust the lecture.