https://kdenlive.org/

It's the default open-source video editor and pretty much an allrounder.

https://www.shotcut.org/ and https://www.openshot.org/ are other options, besides the already mentioned KDEnlive.

Pitivi might be up your alley? https://www.pitivi.org/

kdenlive is not easy and not fast.

I would try different ones and pick the best that suits you needs like shotcut or pitivi