What does it mean that Huangshan Pre-sale Certificate has the official residence pre-sale?

That is, the pre-sale of real estate is the sale of faster houses. At this point, the property buyers only get the contract of auction, not the purchase contract.

That is, after the property buyers select the housing, they pay a certain deposit or advance payment to the developer, and then reach an agreement with the developer that the real estate transaction will be carried out after the developer's building is completed.