This is actually one of my earlier Gimp tutorials, back before I bought a new microphone and learned to use Audacity to clean up the sound. I editied it, tightened up parts and recorded a new audio portion that is both clearer and more accurate. What can I say, I've learned a bit since then.
Anyway, these are some techniques for doing more with the most basic of tools in Gimp 2.8, the selection tools. It turns out they have some nifty and non-obvious features, so this demo shows ways to use these features simply and easily. In two minutes.
Note: Accurate closed captions have been provided, and if English is not your first language, you might want to turn on the auto-translate. I also advise turning on HD and watching full screen so the captions show under the video. All videos ad-free.