Persian people, come

Can you explain Taarof? For example, if someone says you don't have to pay for something, do you have to deny it or you can accept it?

Context: I'm watching a couple traveling the world and they are in Iran, and they mentioned Taarof.

I'm sorry if I'm saying something wrong, just trying to understand.

Ops, wrong category. I clicked create before editing. :'(

wtf why are u watching these videos man, come on.
go live ur life

Not sure if persian know this site