What is a very important skill a person should learn in order to be successful in the world?

What is a very important skill a person should learn in order to be successful in the world? I think this world is changing very fast,there are a lot of skill that we have to learn, like computer and language. If we want to be a succesful person that usefull in the would. I will be bent on computer , becouse it can let us to connect with all the people who is most importan on your business in the would ,and using Web to sell commodities or buy commodites.however,there are a lot of skills are waiting for us to learn, you just do your skill well, and be an authority on your skill, then you well be a person who is successful in the world.