Kim Young-han's lectures that I trust and listen to! There was a time when I was digging the ground by myself, but I realized that digging the ground is inefficient if you don't have any basics. ㅎㅎ.. I think I learned 100 times more by listening to Kim Young-han's lectures than when I dug around. I'll probably have to repeat this roadmap two or three times. I'll also go straight to the next roadmap and listen diligently to the first part of Utilization. Thank you!