It's a really good lecture. I think I'll be able to understand it more deeply because it's long. But it's not a lecture that I'd recommend to someone who doesn't know the basics of development and doesn't know languages well. It's a great lecture to listen to when you want to learn Java to some extent and do side projects and want to use a framework. I just clicked on it without expecting much even though Kim Young-han's lecture was famous, but it's perfect for me.