One of the standard sections of a resume is to have a list of skills - a summary of the skills that you, as an individual, have. What I look at when I see that as an employer is I want to see someone who has a broad variety of skills. It may demonstrate a bit of a desire to learn - an inquisitive mind. What I don't like to see is a list of the 37 programming languages you might know. The fact that you know two or three key ones... you don't have to list them all. I'll assume that you can always just learn another one if you've already learnt one or two. But the other thing you're looking for as an employer is to see, okay they have these skills... where in another part of the resume, such as, let's say, the job experiences, would they demonstrate where they've applied those skills? And I think that is where those two sections of a resume come together and re-enforce the impression you're trying to send to an employer. If you just have a list of skills, but have never shown where you've applied them, it really just would indicate some book learning, which is you have some knowledge but you may not truly have the skill and experience of having applied that knowledge.