The Pareto Principle
The Pareto Principle is 20% of input creates 80% of the result.
I like this principle because it can be applied to so many things. Understanding the principle can help with time management and leading effective employees, and rewarding them for their work. I think the company I work for does a good job of using this principle. Our biggest accounts are Great Clips, Timberwolves, and Ecolab, and I said a good 15%-20% of our staff is dedicated to just those accounts and fulfilling their needs.
Another example is the apps on my phone. I have a lot of apps on my phone and a small number of them are used majority of the time.
I like the idea of using this principle as a guideline when branching out to become a designer and freelancing. Perhaps focusing on a strength I have in an are of design, or specific clients that bring in the most money. I could also apply this for personal growth as well as career growth.