ShotCut

Totally Free.

Open Source.

Cross-platform.

Incredibly powerful and capable.

Not overly resource-hungry. (I'm using it on a 9-year-old PC in my workshop)

Easy to use/learn (even for someone with severe ADHD).

Great support forum/network.

I actually encountered a fault with encoding while using a particular effect and logged it on the forum, then within 12 hours the developer had a fix for it and was preparing it to go into the next update.