Hi Stuart, I had a similar question I asked myself and told my future daughter-in-law about it. She’s doing a lot of stuff for her small business for social media with a free video editor called Capcut.
https://www.capcut.com/
It’s available at Google Play, Apple Store and there’s a free download for windows at the website. I didn’t try it yet, but she creates some really nice videos with it. Obviously it has a lot of useful functions.