It depends on how much experience you have with video editing and how intensive you plan to edit your video. If you only want to do simple cut and paste with simple special effects, you can do it on iMovie (for Mac) or Windows Movie Maker (for PC). If you want to do more serious video editing, there are a whole lot of video editors out there. I am using Cyberlink PowerDirector 13 on my PC, it has more features than I intend to use. Other people prefer Da Vinci Resolve, Sony Vega Studio, Adobe Premiere Element etc. The more expensive and powerhouse video editors are Fine Cut Pro (for Mac) and Adobe Premiere Pro (for Mac and PC).