I first came across Alan's lectures through a friend's recommendation. I was able to trust him even more because I thought many people really listen to this lecture because it ends every semester. In my case, I knew the basic grammar of programming, although it wasn't Swift. After listening to Alan's grammar lecture, I could feel that my basics had become much stronger. In addition, the textbook that Alan provides in this lecture is very specific in content and is described in detail with pictures that can be understood at a glance at any time. I think that just looking at this textbook alone is very helpful. I can confidently say that you won't regret taking the Swift Grammar Master School course even if you are just starting out with iOS or already know iOS. I also recommend this course to my acquaintances who are hoping to become iOS developers. If Alan creates other courses or releases new courses like SwiftUI, I think I will listen to them again. That means the content of the course is really informative and you won't regret it. Motivation is also really important. I was able to get a lot of useful information by using the Slack channel to check attendance every time and hold online mock-ups with my teammates every week, motivating each other and sharing information. If you are new to iOS, I highly recommend this course.