I highly recommend this to developers who are developing apps with nodejs+mongodb. It teaches even the complicated parts well with easy-to-understand explanations. There are two shortcomings. One is that there are parts where mistakes are made here and there and it takes a lot of time to find them, so it would be better if those parts were edited. Second, the practice screen is too small to follow. I wish they had zoomed in a bit more and taken a picture of the practice screen. The content itself is VERY GOOD. Thank you.