As the title suggests, this is a comprehensive lecture on mongoDB. I haven't finished it yet, but I can't help but be amazed as I watch the lecture. Although it's a lecture on mongoDB, I was able to understand the explanations on source refactoring, performance issues, etc. It's such a rich and good lecture, so I highly recommend it. I'm really grateful to the instructor for creating this lecture!! Please continue to create lectures like this in the future~!!