The vehicle is the part of your plan or your system that gets you to your goal.
If you want to earn a million dollars, you increase your probability of getting that much money by playing a million dollar game. You must work in an industry where someone can make this magnitude of earnings.
If you want to own a farm, you increase your probability of having a farm by playing a game that can bring you a farm.
Properly, this topic is part of Planning. But, the vehicle is so important in the plan, so obvious, that it deserves it's own topic.