I am very indebted to Toby's Youth Room. I am first impressed by the true teacher who always checks my progress, and then secondly impressed by the detailed and concise explanations when real coding begins... I am a poor student who only feels this way and criesㅜㅜ All I can give is a 5-star rating and a review with a little msg, but you will still support me, right? Thank you so much for the great lecture!