It's good for reviewing basic concepts. The layout and less parts were very helpful. I'll have to study the parts I'm curious about on my own. I listened to Yoon Ji-soo's lecture online 4 years ago, and it was really helpful just by watching it. He explained things like how to view developer tools that I thought I knew for sure, but no one explained them to me. I was happy and glad to feel that way again while listening to this lecture. Thank you for uploading the lecture for free.