And, depending on what you need to do for many compositing/Animation-things Blender can be very powerful too. You can use it's compositor without rendering 3D and with the greasepencil animation tools you can basically draw onto your images.

I mentioned it, because over the years my number one alternative to AfterEffects became Blender.

Yeah I have a lot of love for DaVinci, and for black magic's decision to maintain a Linux version of the software. Quite funky UX but a solid piece of software overall. It may be the best free closed source video editting program, with the open source alternatives trailing quite far behind in terms of stability and features/usability (not that you shouldn't spin up KDEnlive and give it a chance!).

Something to keep in mind with Fusion in DaVinci Resolve is that it is an embedding/integration of the Fusion Studio toolset into an all-in-one application. There is a difference in available features between DaVinci Resolve and Fusion Studio, a paid product. I want to say DaVinci Resolve Studio closes most of these differences, but I'm not 100% certain. I still have my Fusion Studio dongle that allows me to use both Fusion Studio and DaVinci Resolve Studio.

https://www.blackmagicdesign.com/products/fusion/compare

A dedicated compositor would likely want to lean towards paying for Fusion Studio rather than DaVinci Resolve Studio (both cost $295 USD). The standalone application provides greater flexibility in terms of working on multiple shots at a time (multiple scenes open) and being able to focus on the specific task at hand. If the work originates in Resolve, VFX Connect can be used to launch the clip in Fusion Studio.

It does not support normal mp4 (H.264 and aac) files on Linux.