One of the most important things I've ever learned

One of the most important things I ever learned was customer service. This may seem weird at first but the reason for this is because learning customer service helped me be successful at my first job. It also helped me in general as well. I apply what I learned to everyday interactions. Things like how not to make people mad or how to deal with people that are mad at you without losing your cool and how to be helpful to other people is useful in any situation.