It's really different from other grammar lectures. While other grammar lectures just tell you, "That's the concept.", Alan's lecture explains why this concept came out, how it's used, and what advantages it has. He also explains not only Swift grammar but also CS, so that you can understand the answers to questions asked in interviews at large companies (or other IT companies) rather than just memorizing them. If there's anyone who's doing iOS development but feels like they don't have much depth (I used to do that.. hehe), I really, really recommend this lecture 👍