I am a junior developer in my first year who is struggling with development in collaboration. I feel a sense of inadequacy every day, so I am studying by paying for various online lectures that fit my stack. When I happened to come across a JavaScript lecture uploaded to Infraun as an event, I thought it would be nice if other lectures that I needed were also uploaded, but Nest lectures were uploaded like this... I felt like I was being investigated, so I came to see it. I hesitated to buy it because it was not cheap..;;;;; but it deals with a service that I have always been curious about, so I started studying. I have not taken all the lectures yet, but I am only taking the lectures that I need, and I am so satisfied that I am leaving this review. After studying the search part first, I was able to understand the concepts that I have studied on my own or through other lectures well organized in the detailed lecture explanation. Based on this concept, I have expectations that it will be much easier to apply it on my own. For now, I am very satisfied with this one thing. I still need to check out the other lectures, but looking at the provided Notion materials, I am looking forward to other lectures as well. It's not a small amount of lectures, but I plan to take my time and listen to them carefully. I'm leaving a review because I think it might be of some help to those who are hesitant to buy it because there are no reviews.