I first took the instructor's "Analyzing Python Data with Public Data" course, but I felt that my basic knowledge of Pandas was very lacking, so I looked for other lectures and found this one. As I listened to the same instructor's lectures in succession, I noticed a connection between the lectures, and I also learned how to look at the cheat sheet. And at the end, I learned how to apply the concepts I learned before to the Seoul City Corona analysis. Since the explanation was calm, I learned about the parts that can be done with Pandas overall. It wasn't difficult to understand, but the rest was up to me, so I just had to listen to it several times to make it mine.