Although you must have worked hard on it, I found it quite disappointing. Please keep this in mind. When explaining the coding style, instead of logically explaining the reasons, you explain it as if it's just your personal preference. The code is disorganized. I wish there were no subtitles on the video. It would be better if I could turn subtitles on only when needed, but the large, pervasive subtitles with many typos were distracting. If you're going to embed subtitles in the video, I believe it could have been produced with more care. Having studied with overseas courses, I purchased this because the table of contents looked good, but it's quite disappointing for the price.