Neon - essentially Ubuntu with the latest KDE Plasma on top. Not only does it give you the “ready to play” base that is Ubuntu, it had “discover”, a very easy to use front end for package managers that lets you do exactly what you’re asking for there in that last sentence.
“Stop trying to make Snap happen. It’s not going to happen!” – Regina
All doubt that leaving Reddit last Friday was the right choice: Gone.
Delete your posts ‘n’ comments in order to rob them of their treasure, your data.
Upvote for Kdenlive - it’s fairly basic but quite good at what it does do.