I am a career developer. I was studying alone because my coding test skills were lacking, but I found this lecture while looking for one. The conclusion is really satisfying. Since you explain code debugging with pictures, even beginners can understand it well! If there is something a little disappointing, It would be good to explain it by drawing it in real time, but it would be cleaner if you made it into materials in advance and used it. And it would be better if you drew it with a drawing pad or something!