What was difficult every time I studied Kotlin and Flutter was... how quickly things kept changing, but it's so great that I can study without any problems as of now when I'm writing this review... And I think the lecture is even better because it pinpoints exactly what I wanted to know. One more thing, there's an issue around lecture 17... For non-experts, https://esanghanwooju.tistory.com/3 <--this has the most detailed explanation, so you can refer to it.