After failing the 5th practical exam with a score of 12, which I had studied on my own, I lost motivation, but after encountering this lecture, I prepared for the 7th practical exam for about a month. As a non-major, I had a hard time because I didn't have a solid conceptual framework for coding when I studied by picking up bits and pieces here and there. However, as I listened to the lecture slowly and followed along, I started to think, "This is it," and when I saw a new problem, I thought, "Oh, I can do it like this." When I saw the problem in the exam room, I wasn't 100% sure, but I tried to handle each condition in my own way and got a much higher score than I expected (30, 40, 20). Through this lecture, I passed the exam, regained my confidence, and most of all, I gained interest and passion for data analysis. Thank you!