there's no 和 it's no

there is no 是存在句there be 的具体形式，表示存在

it's no 表示 没有，不是....

例如： There is no people in the room.房子里面没有人。

It's no need to give her the book.没必要给她那本书。

是there's not和it's not吧
there's not意思可以说成：不是 不过要看句型了
it's not意思：它不是