What is meant by the term opportunity costs when evaluating from different projects? For example, the opportunity

Question:

What is meant by the term opportunity costs when evaluating from different projects?
For example, the of going to college is that you might not be able to pursue a 2nd job to earn money. This is a short term financial hit, but in the long-term you will earn more money. Can you give us another example?
Opportunity Cost
Opportunity cost is the profit lost when one alternative is selected over another. The Opportunity Cost refers to the expected returns from the second best alternative use of resources that are foregone due to the scarcity of resources such as land,...