I am a server developer at Kakao who participated in creating this lecture together. I also mainly use MongoDB and utilize it as an attractive NoSQL. This time, the lecture content is a topic that mixes theoretical parts and practice. As such, I tried my best to help you understand MongoDB. You might think there aren't enough practical parts, but I believe that queries are something you really need to keep typing out yourself. Therefore, the recording focused mainly on which operators are available and the precautions associated with each operator. I hope this lecture, which I worked hard to create, will be of great help to those who watch it. Please show a lot of interest!! Have a good day~!