What should a reply to "What's up?" be? [duplicate]

Solution 1:

"What's up" means "What's happening." I usually just reply "nothing." because nothing is happening to me.

But, there are alternatives, such as the usual reply to a greeting:

1. Not much
2. Nothing. Yourself?
3. I'm good, yourself?
4. Good. How are you?

However, if there is something that you would like to tell the other person e.g. You've sold your car, it might go like this:

A: What's up?
B: I've sold my car.
A: Good on you mate!

Solution 2:

Normally people reply "not much", which I think is the appropriate way of answering this question when you are not doing anything. But in case you are doing something, it would be better to say what you are doing.