I always heard those sentences but I cant understand what is meaning of these?
1- here you are
2- here we go
like that sentences...maybe it's a stupid question but really I cant understand...
I agree with Copyright that the context would help. In general, someone might say "here you are" if he were giving you something. So if you asked for a cookie and I gave you one, I would say "here you are" (or "here you go") as I was handing it to you. Also, if I lead you somewhere (a specific department in a store, perhaps) I might say, "here you are" when we arrive.
I might say "here we go" if we were literally starting to go somewhere. It also might be used sarcastically in a situation where someone starts talking about a topic or acting in a way that others expect, but hope won't happen.
Hello light the moon - welcome to WordReference
You will find lots of examples of these expressions if you look at these previous threads.
I found them by using the forum's dictionary and thread title search for here you are and here we go