对【duì】

对 points an action or attitude at someone or something. It goes before the verb, with the person or thing attached.

对 or 跟

跟 is a two-way "with" – both people take part. 对 is one-way, aimed at the listener.

对…好 and other attitudes

How someone treats or regards something takes 对 + the person or thing, then the adjective or verb: 对…好, 对…不好, 对…感兴趣, 对…认真.

English puts "in", "for" or "to" after the adjective; 对 goes in front of it.

• × 我感兴趣中国历史 → 我对中国历史感兴趣

对 as "correct"

As an adjective, 对 means "right, correct", and that is the use you'll hear most in conversation. On its own it confirms what was just said.

对不对 tacked on the end asks for confirmation, the way 是不是 does.