I am a major studying Android. Recently, many companies are looking for Kotlin developers, and I personally became interested in it, so I was looking for a lecture and ended up taking this lecture. Before starting this lecture, I first learned the grammar through Joyce's free Kotlin lecture, and I think that basic Java programming is necessary for learning Android. The lecture itself was high quality and systematic. I could clearly see why Kotlin is rising more than Java in Android app development, and since it covers important concepts with quality, I was able to take the lecture with focus even for review. I think that textbooks are essential for learning Android, but I think that the project practice and Google distribution-related parts covered in the latter part of this lecture will be able to fill in the gaps in the Android textbook alone. If there is a chance next time, it would be good to have a lecture on Android advanced projects or app development contracts :)