probably one of the best free video editing programs out there atm is davinci ( https://www.blackmagicdesign.com/products/davinciresolve/ )

for simple editing though I used to use KDEnlive a lot, pretty easy to wrap your head around, allbeit with a few quirks that take some getting used to ( https://kdenlive.org/en/ )

I’m sure theres others but those are the two I’ve used personally.

Kdenlive is my go-to these days, but it’s interface can take a moment to get used to. Plenty of tutorials and such on YouTube, however.

If you’re on a Mac, iMovie is as good as it gets for casual production. Look no further.

Finally, if you’re on Windows and don’t like the look of kdenlive, I don’t see any reason not to use Windows Media Maker from Windows Live Essentials 2012. There’s a lot of crapware around these days pretending to be a modern version of Media Maker, but the old one still does what it needs to, and to my knowledge there’s no official replacement to date.

DaVinci Resolve. It’s good and mostly free, allowing you to export up to HD resolution. Premium features include more transitions, fx, and higher resolutions but the basics are covered free.

I can’t vouch for the low learning curve. It’s intuitive enough for basic basic stuff but I still find myself going to YouTube tutorials often. However- I’m always a slow learner, so it might be just me.

Shotcut is quite powerful, fully featured, and absolutely free.

Microsoft’s new ClipChamp is more user friendly and the most basic version is free, with some limitations.

ffmpeg, if you don’t mind the command line… there’s only two options you really have to know for editing, -ss and -t , starting time and length, respectively… also don’t forget that first -i for input file name, output file name is always last
eg, ffmpeg -i input.mp4 -ss 00:01:40 -t 00:05:00 output.mp4
that would clip out five minutes starting at a minute forty seconds in, the file names are obvious