"Marketing" is the most important business skill there is. Here's why: All business are really in the exact dame business...its the business of "Getting and Keeping Customers" Thats the only point to every business on the entire planet.
"Marketing" is the art and science of getting and keeping customers...and its important to note...marketing is not just advertising.
Marketing is happening at every instance something from your company touches a consumer....this includes, business cards, brochure, TV commercials, product packaging..but more importantly it includes YOU and it inlcudes your employees, and the processes you put in place to make your business function from day to day.
Your skill in marketing then, will ultimately influence what happens everytime something from your company touches a consumer.
So...you'd better get real good at it.
good luck on your journey.