What skills should every freelance digital marketer learn to stay competitive?

[Btaliat]

You need to have some skills as digital marketing to stay competitive. The fact is that there are many people that are into digital marketing. And ability to stay competitive will make it easier for you to stay relevant. That's why you need to learn how to communicate and negotiate with your clients. You need to know how to seal deal with them in such a way that it won't affect neither of you. What other skills do you think?