how to display carts table in any page

I'm an amateur when it comes to working with Opencart.
I want to add a menu item to my website which will open the carts table like a pop up. I tried to include cart.php to head but the result was a nearly empty table.
Is there anyway to solve this?

well, if you're an amateur on OC, then better take, what you get, and
start to learn first, before trying to add some things to this software.
It's the only way, OC is not just a package of HTML/ PHP Pages, it's
a Framework, and one has to understand, how an MVC(L) Framework
functions, before one tries to add some Custom Content anywhere.

But just don't take it personal, it's not meant this way, I just want to keep
you from ending up in plain frustration, since no-one here will invest a huge
amount of time, just to get you on track. After all, OC is a commercially
used Software, planned, to generate Income, for everybody involved.
Good Luck
Ernie

You're asking for a lot of explanation here, it's like saying "I've never changed a car engine but how do I do it?"

Well, sure we can tell you but it's not a simple answer. So you might be better of asking for help on the Commercial Forum.