I learned the principles of why the content I heard in the free lecture was used that way. And I'm a student who just started learning programming, but you explained it so well that I feel like a genius ㅋㅋㅋㅋㅋ So thank you so much. I tell my boyfriend about you all the time^^ He says you teach so well and are so kind, thank you!!! Thank you~ Teacher Kim Young-han!