My experience with Swift started with only a brief familiarization with the official documentation translation. Compared to other languages, I was overwhelmed by the many grammatical features that I had to know, but after listening to Alan's lecture, I think it became clear what I should focus on. The introduction to the basic grammar at the very beginning was so simple (and there was nothing to go into depth), that I almost lost confidence in the lecture, but as I got into object-oriented programming, I felt that Alan's unique memory structure and the paradigm of explaining it were taking root in me, and I was impressed by the lecture structure. I am really looking forward to the app lecture that will follow. If you are a beginner who wants to develop iOS, there is no need to hesitate. Buy time with money!