Question

what is the meaning of
1- How are you doing?
2- What's up?

Answer 1

hey mate!

here is your answer:

1. how are you doing means asking about the health particularly whether someone is ok or not.

2.what's up means what have you doing or going to do recently

hope it helped ^_^

Answer 2

How are you doing means you are okay or not today.

what's up means what are you going to do now.

hope it helps you