Thanks for the info, i'll give it a look. It sounds like just the thing i'm looking for.If you want something that's free that doesn't require any kind of signups that can do stuff beyond just slicing the file, OpenShot is a good one and it's quick to learn if you have the most basic level of computer literacy.
I learned openshot and threw together a trailer for my game in a day so it's definitely fine for your use case I'd say
This game just delivers so many "holy shit" moments i can't stop taking clips.