1. First of all, it was good to be able to understand the outline of MongoDB through this lecture. It is a good class to judge the overall content at a beginner level. 2. First of all, the PPT is pretty, so it is easy to concentrate. It is because rice cakes that look good are also good to eat. 3. One thing that is regrettable is that if the instructor had prepared the lecture a little better, it would have been a higher quality class. There was a feeling that the preparation was a little lacking in the comments and situations in the middle, so from the student's perspective, it was less of a sincere impression. 4. Nevertheless, there is no major problem in understanding the overall content. I recommend it to those who are new to MongoDB.