X is Y X(은/는) Y(이)다 This is a book 이것은 책이다 That is an apple 저것은 사과다 Sky is blue 하늘은 파랗다 Apple is red 사과는 빨갛다 X is not Y X(은/는) Y(이/가) 아니다(Y is noun) X(은/는) Y지 않다(Y is adjective) This is not a book 이것은 책이 아니다 That is not an apple 저것은 사과가 아니다 Sky is not blue 하늘은 파랗지 않다. For Korean drama, refer to http://www.listchallenges.com/top-100-k-dramas

I recommend this youtube channel https://www.youtube.com/playlist?list=PLEE61FC0F678BCE52 she answers the question you have very quickly and clearly. and for dramas my personal favs: -Protect the Boss -Bride of the Century -The Greatest Marriage