If you want to edit on a computer, with a Mac I would use iMovie most likely as it fairly easy to use and it's free on your computer. I tend to do most of my video editing on there when I'm looking to move quickly. When I'm doing something more complex I'll use Adobe Premiere.
On Windows last I knew they have MovieMaker - not the best, but it does work. Premiere is also available for PC too. I want to say both platforms have a cheaper version of it that's lighter in the toolsets, but I haven't gone looking at that in a long time.