Avidemux, for cutting/trimming...
And Openshot, without a doubt, for simple, straight-forward, easy-to-understand video editing...
'Nuff said. (I've experimented with Cinelerra, but it's one
awkward SOB to figure out; it's not at all intuitive for beginners. Bearing in mind we had queries on the Murga-Linux Puppy forums from a guy in South Africa, who works for a local TV studio, about where to find the 2.3 CV version.....to work on an elderly Acer laptop (which they use, 'cos they make do with old hardware over there), well.....that statement is self-explanatory.
He's been using it for years.....and has gotten totally used to his own personal work-flow after all this time...)
Definitely a 'semi-pro' app.
Mike.