The first thing to remember is that the goal is to empty your personal draw pile before your opponent(s) can empty theirs. Everything else should revolve around that goal. There are two elements of Skip-Bo that you control: playing a card to one of the center piles and playing a card to one of your discard piles.
In common usage, an expense or expenditure is an outflow of money to another person or group to pay for an item or service, or for a category of costs. For a tenant, rent is an expense. For students or parents, tuition is an expense. Buying food, clothing, furniture or an automobile is often referred to as an expense.
Expense is simply a decrease in the net assets of the entity over an accounting period except for such decreases caused by the distributions to the owners. The first aspect of the definition is quite easy to grasp as the incurring of an expense must reduce the net assets of the company.