For a car dealership to know where to advertise they need to answer these three questions:
1. What is the goal of the advertising campaign?
2. Who is the message targeting?
3. Where can you get your content in front of that target audience?

When these three questions are answered, we then have a base of knowledge to establish where to advertise, who we target, and what action we want to be taken. This avoids trial and error trying to find where results will occur. The goal is to limit wasted marketing spend but increase the results.