If you are to publish these videos on Youtube, it has own editing interface, you can use it very easily for simple tasks.
If you want to do it on your computer, the most granny but simple program is iMovie. You can also check out ApowerEdit, VSDC Free Video Editor, Rocketium and Filmora. These are enough for you now, but if you want more in the future, you can use Adobe Premiere Pro or Avid.
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