I would like to give it 4.5 stars, but it is impossible to rate it in decimals. However, it is too bad to give it 4, so I will just give it 5. In my case, I skimmed through an introductory AWS concept book, and I have some understanding of servers and networks. So I didn't have much difficulty following the lecture. It was good that I could look at the core functions of AWS in a short period of time. Rather than boring explanations in detail, I liked the simple and easy examples and explanations. If there is one thing that was not good, it would be that the explanations were lacking for beginners. And since the instructor has a pattern that he keeps using, he explains it based on examples that he is familiar with. Rather than IDs like glumin or lukee, it would have been better if he had created meaningful accounts like admin_a or dev_a. The names for each item were too impromptu, which was confusing. The additional lectures were good for the lacking parts, and the instructor's personal humor was also good for my taste.