Wow, I finally finished the DB Basics course too!! When I was learning about joins, indexes, and transactions, I went "ah~" and understood them, but there were parts I just understood and moved on without fully mastering or memorizing, so I thought it would be good to listen once more later. But in the last lecture "What's Next," when Younghwan said "Think of it like a blueprint - understand it once while going through it, then listen again while organizing it and it will become yours. Just like how difficult things from middle school seem easy when you look at them again" - that really resonated with me! I'll polish it up more and listen while thinking "ah, this part must be about this" when I get to performance optimization and design sections!