A lecture that is completely easy for beginners to watch, and a good lecture for experienced people to look back on. I am a common iOS developer who has been helped a lot by iOS development since Yagom's blog post several years ago. Since it is a lecture for beginner developers, it is a lecture that accurately points out how it works and what it is rather than simply developing functions and following code. It is a lecture that is helpful enough for beginners as well as iOS developers with some experience to look back on. As of 18. 12. 30, it is a different version from the latest version. There are some differences, but there is no problem at all watching the lecture! The weather is crap these days, so please give me another good lecture next time.