1. あなた — Anata. Typically written with hiragana, あなた is the standard, polite way to refer to the listener in a conversation, though generally it is only used when you do not know the name of the person you are speaking to.

Is it rude to say Anata?

When Japanese people explicitly state “you” in their sentences, it's proper to use the person's name and attach a suffix. You are probably already familiar with “～san”, which is a polite suffix. If you use “anata” with someone who you know, it is rude.

Is it okay to use Anata?

It is perfectly OK to use あなた ( = anata) when you study the Japanese language. Writing sentences, translation, etc.