Hello, Younghan! I'm currently a computer engineering student and I'm working hard on developing an Android app for a development club. ㅎㅎ I started studying the server side in earnest in the first semester of this year, and when I was studying API (especially, writing the specification was really hard..), there were many parts that I didn't understand, so I took this lecture on a friend's recommendation. I guess there's a reason why everyone recommends it. After learning the network knowledge I learned in undergraduate classes and the various HTTP operation principles used in current development, I'm getting a lot of help with my projects! Thank you for always giving great lectures!!