I’d say Kdenlive is pretty good. The UI feels a bit clunky and dated, but other than that it’s a capable video editing software.

Kdenlive - Worked the best for me, but has the worst name.

Shotcut - Seems feature rich and reasonably good

Openshot - Seemed more approachable, a little less performant.

Blender - I’ve heard it includes a good video editor in there somewhere, tho I’ve never used that.

Olive - I think was another Foss video editor? But it might be discontinued. Never tried it either.

I’ve only ever used kdenlive and it was adequate for my needs I use it only for very trivial editing tasks tho, so I can’t say about anything complex