I recommend this as the first AWS introductory course. I studied the theory piecemeal and came across it, but it was very helpful as I actually handled the functions. I couldn't attend the lecture right away and took it for a month or two, and I had a hard time resolving it because I was charged during that time. I would like to have some guidance on the items that incur charges. (I posted what I experienced in the Q&A, so I think it would be okay if those taking the course refer to it.) In addition, I think it would have been better if you opened the architecture diagram in the middle of the lecture and checked it once. Thank you for the great lecture.