As of July 2022, I downloaded Android Studio 3.0 and followed the lecture, but I got an error and couldn't check anything. When I asked an existing Android developer, I was told that the version was not available. So I downloaded the latest version of Studio, but the structure was completely different, making it difficult to follow the lecture. It seems that at least the minimum troubleshooting content needs to be added or the "latest lecture" that fits the reality is absolutely necessary.