Physical gold is common at ordinary times. The kind of gold in Huang Cancan is also called gold. Paper gold is to store physical gold in a certain place, and that place gives you a "certificate of deposit" that can be used to trade mortgages and so on. Gold mines don't understand. Gold futures means that you buy a batch of gold, which will not be given to you immediately. It may be six months later or three months later. It depends on how the contract of this batch of gold futures is stipulated. If I give it to you right away, it's called gold spot.