Finally, I finished the second part of Nap. I think it was the first time in my life that I studied in a fun way. I want to see the next lecture soon. Oh, and this is just a shortcut that I know, but I think it will be useful to the instructor, so I want to share it with you. If you press [Win key + Shift + S], you can select the screenshot area right away without opening the capture program, and it will be copied to the clipboard, so if you ctrl+v it to Excel or something, I think it will be very helpful to the instructor's teaching method. As a side note, thank you for allowing me to take such a great lecture at a reasonable price. I look forward to your future lectures!