DaVinci Resolve is fully professional grade video and audio editor, primarily for video and audio post production.
There are two versions. DaVinci Resolve, and DaVinci Resolve Studio. The standard version is free, and is fully featured, with the exception of a few effects, and the ability to output in 10bit HDR, Ultra HD.
The standard version can do Ultra HD but only in 8bit colour.
So what’s the catch?
Being a pro editor, the learning curve is steep. However, there are superb tutorial videos only a mouse click away, Having played with it for about three weeks, I’m getting to grips with it, and even I can make some very professional looking video edits from the countless amount of video footage I have from my Samsung S9 phone which were shot in 4K.
You owe it to yourself to least give it a look. Start with the free version would be my recommendation. The Studio version is £249.
I’m using version 16 which at the time of writing is in beta (version 3), and has the very latest innovations, and IMO is state of the art. Although its beta, I find it is very stable. But if stability is an absolute must, then version 15 would suffice.
 It requires a powerful PC, with at least 16GB of RAM, and I would recommend at least a 1000 series NVidia GPU. Mines is a GTX1060 and works well, but a more powerful GPU would be even better. If you have at least an 1000 series NVidia GPU then use the Nvidia Studio drivers rather than the gaming drivers. You can get those from NVidia’s website.
DaVinci Resolve is a 1.5GB download, so you should also be aware of that.