I started to get into shooting and editing video footage. I use a drone for some fantastic aerial shots. I passed the Part 107 test to get a remote pilot certificate so that I could use the footage in any way I pleased. I could not afford to upgrade my computer for one that was already outfitted for video editing, so I looked for the best budget graphics card I could find. In order to see your effects and transitions rendered in high definition in full time, you need to offload a lot of the processing to a good graphics card. It makes for a much nicer video editing experience.
If you really get into special effects for video, then a good graphics card will let you see how it will look applied to a scene without having to render it and check it. That method can take forever in tweaking an effect. Even a modest model of the best budget graphics card can add tremendous video rendering capabilities that the best CPUs cannot. Ones that pros use can be very pricey, but there are some budget models out there that can do some amazing things for a much lower price.
Your CPU in your computer will need to handle all of the video rendering to see things such as live changes to video edits. That can bog down even a good system. Modern CPUs have on-board graphics capabilities that are amazing, but a discrete graphics card has its own CPU and RAM. This can take a lot of the heat off of your main CPU, and I mean that literally. Video editing is one things that can make your PC run at its maximum. It is like redlining an engine the whole time. If you edit video, you need discrete graphics.