Currency: select the currency which listing’s price is according to that. For example USD.
Price: amount that this listing has, for example $250.
Price(Max): if the listing prices are in range, you can enter the maximum price here.
Price Description: this is an additional description that shows with price for example “per night”.
Price Class: You can define a price class for your listing and it will show on some skins. For example grid view “Style 3”.