At what prices I will be buying/selling bitcoins?
Scenario 1

Using a simpler example, if you visit bitcoin.com.au to sell Bitcoin you will get the sell price for k Bitcoins. In this example, it is a spot sell price.

Scenario 2

Using a simpler example, if you visit bitcoin.com.au to buy Bitcoin you will pay the buy price for k Bitcoins. In this example, it is a spot buy price.

Elsewhere

On market exchanges, the buy and sell price are market indicators. These are the general level of the buy and sell orders. You can creae a buy or sell order for, usually, any price you like but the indicators show current trade values.

If the exchange lists a spot price, this is usually their spot buy price, for if you wish to sell to the exchange directly without creating a market order and waiting.