A good lecture to get rid of the fear of Android app development. However, the "systematic curriculum" or "grammar learning" mentioned in the lecture introduction are nowhere to be found. Of course, I agree that it is wiser to skip over it for now rather than explaining it right away for those who are learning coding for the first time. However, this lecture has too many explanations like "If you follow along like a parrot, you will create this function." As a result, it can give you the courage to think that you can create something, but in terms of development skills, this lecture is of little help. If you want to create a new service using the lecture content, you will eventually have to find other learning materials and study from the beginning. It is not a bad lecture, but compared to what I expected from the lecture introduction, the direction of the lecture is too focused on stimulating interest, so I think it is a waste of money.