how do you say 'you are' ?
for example i wanna say you are cute, is it " ni shi ke ai" or "ni hao ke ai" or something else ? because i hear some people say "ni hao " when saying you are, but i thought ni hao means hello

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"ni hao ke ai"is right.
The "hao" in “ni hao” is totally different from the "hao" in "ni hao ke ai".
The "hao" in "ni hao ke ai" is a adverb.It equals"very".
“ni hao”means "Hello"

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You  can  say"ni shi "or"ni hao"

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Definitely not "ni shi ke ai," but you can say "ni hao ke ai" or "ni hen ke ai." Besides "good" (ni hao = hello = "you good"), hao is also an adverb that means "very." So "ni hao ke ai" means "you're very cute."