I think this is the most in-depth lecture among the grammar lectures. I think the real value comes out when you listen to it all at once and then look up memory-related information while writing actual code. That's because when you listen to the actual lecture and don't know how classes or closures that were ambiguous are applied, and when you apply the actual code and create an app, the real value comes out when you look back on your curiosity. It's like looking at math textbooks after only looking at math textbooks. It's really detailed and teaches by approaching the principles. What's certain is that it's a refreshing lecture that solves all the problems, even the invisible ones, when you code.