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If a country can just print money, is global debt between countries real? 
To understand this fully one would need to understand quite a few things. Not in scope here. In short, whenever China sells goods to US, it gets USD as most of the trades are in USD. China uses this money to buy other things it needs like Oil etc. After this they still have quite a bit of USD left with them. The money is left with them because US is buying more things from China and selling less things to China. This creates a surplus USD with China. So if US were to borrow money from China or any other country, it would be this excess money. Ofcourse how money gets created in first place is a different topic altogether.