Since there are so many different contents in MongoDB, I have included the contents that you can learn quickly and have the highest utilization among them. In fact, since MongoDB is a big data DB, it even includes shards and the content is really vast. I am also preparing a lecture that covers intermediate MongoDB technologies based on this lecture. There are so many IT technologies. The learning method that I recommend is that each technology has a really diverse and detailed grammar and function, so I do not recommend learning everything thoroughly when you first learn it. You should focus on understanding the most utilized and easy to learn content and becoming familiar with it. That way, the content you learn for the first time will catch your eye, and you will be able to get used to it. After that, it is good to add the necessary grammar one by one as needed. Among beginners, there are some who try to learn everything thoroughly when they first learn the technology... I have never seen anyone like that who properly understands the technology and uses it well. That is why I considered these various effective parts. I think that after learning this lecture, there will be almost no one who cannot use MongoDB. Among other instructors, there are probably some who explain in detail from the beginning even the techniques that each person might want. If you like that style better, I think it would be good to take such a lecture in the future. Thank you.