For all those who keep saying you can't edit video on GNU/Linux the FSF has announced Seth Kenlon will be having an online workshop to show users the basics of editing videos on GNU/Linux using KDEnlive. There are lots of other great video editors as well though. My favorite is OpenShot, but KDEnlive has also come a long ways since it's early years. It's now a stable usable video editor.
https://www.fsf.org/events/workshop-video-editing-with-kdenlive