Help me translate simple phases

[CupNoodle]

I am still learning the language, and building up my vocabulary, but how would I say these sentences:

I am the best.
You are the best. (boy to girl)
He is the best.
She is the best.

[TLT]

First, it is important to know the person you're talking to. Because talking to female is different from talking to a male. It also depends on age and the relationship between you and the people you talk to. That's how complicated Vietnamese is.

[CupNoodle]

First, it is important to know the person you're talking to. Because talking to female is different from talking to a male. It also depends on age and the relationship between you and the people you talk to. That's how complicated Vietnamese is.

Ok, sorry for the late response on this.

It is from boyfriend to girlfriend, the girl is 3 years younger than the guy.

[TLT]

I am the best. Tôi là giỏi nhất
You are the best. (boy to girl) Em là giỏi nhất
He is the best. Cậu ấy giỏi nhất
She is the best. Cô ấy giỏi nhất