Board Thread:Support Requests - Getting Started/@comment-26136549-20150222224455

This may sound stupid, but I'm new here and I don't really understand the + and - things that are on my Contributes page. For example, I made a page and added some stuff, and the edit appeared on my Contributes page with a (+5,425) next to it. When I made a different, smaller, edit, it appeared with a (-9) next to it. Does that mean I've done something wrong? Please help because I don't understand what's going on. 