There 2 strategies of running businesses: 1 focus on marketing and advertising, as long as people are willing to pay for the product, the rest is minor; 2 focus on production, as long as the process of building the goods is efficient, people are willing to buy them because of price/quality.

Lots of my personal values and principles were grown at Amazon, so definitely I believe in the 2nd strategy more and focus on skills that improve efficiency.