I watched a free Android Studio lecture floating around on YouTube. (I won't mention the name of the YouTuber ^^) But the instructor I watched was an amateur, and I learned from watching an amateur's lecture... When I was developing an app in the field, there were a lot of obstacles... If I had watched this lecture from the beginning, I would have been able to develop it much more easily... Thank you for uploading such a great lecture. In addition, rather than approaching it without knowing anything about coding, try learning basic coding knowledge in C language and apply the programming grammar you learned to the project you are doing here. For example, there is a switch statement in C language. If you know the switch grammar, you can apply the switch grammar when studying the "Transfer data between screens" part of the Twice app creation. Oh, of course, there is no switch grammar in Kotlin, but instead, there is something called when that has the same function as switch. I recommend searching for this additional knowledge in English (English is essential for programmers in the first place) rather than Korean to improve your Googling skills. Anyway, I had a lot of nonsense, but thank you so much for uploading such a great lecture. After finishing this lecture, let's quickly look at the beginner level.