Previously, when I was studying iOS development, it took a very long time because I had to search everything with vague iOS development knowledge + vague grammar knowledge. However, after listening to Alan's grammar lecture, I was able to understand Swift in detail and deeply, even in parts that I didn't know (?!ㅋㅋ), and most of the Swift grammar became understandable and usable while developing, making studying more enjoyable. Haha.. And it was also very helpful for interview preparation. I think I will refer to the content I organized while listening to the lecture for the rest of my life. Thank you :)