I don't have any marketable skills. Everyone has skills. For example, if you took a course in marketing, you would not claim to be skilled at the Ph.D. level, but you could say that you have a grasp of some marketing basics and outline a few specific skills on your resume.
Many people also overlook volunteer experience as a place to draw upon when marketing their skills.
This is not to suggest that you hide the fact that you provided a community service without receiving monetary compensation. You can include that in your description of the volunteer position, and then consider the skills you needed in that role to be successful. The things you do at home or in your free time may also be rich with marketable skills. If you get stumped, or still think you have nothing of value to offer, think about asking someone who is familiar with your work what THEY think your particular skills are. Individuals reading this column bear responsibility for their own career decisions, and in evaluating the advice offered in this column, do so understanding that neither Averyl Hill nor DI-USA shall not be held liable for any decision made, omission, or action taken by them or others based, in whole or part, upon information provided by these columns.