Front end development is not just for developers. Learn how to make websites from a designers stand point, that will actually help you in your day to day. Not only will you be able to see eye to eye with developers and design with a better understanding of how the web works, you'll learn to prototype and build websites in a way they won't break. A great plus is that designing in the browser is a powerful technique to have when doing responsive web design.
Basic understanding of CSS and HTML.
Not a prerequisite, but pre-reading of SASS is a nice to have.