Editing using greenscreen

using stock footage from pexels which is a site that provides videos and pictures with green screen backgrounds, I edited one of my previous edits from aftereffects. the first step was to use key light to match the color of the green screen background, after this I was able to place my previously edited video and scale it to a size which fitted perfectly into the green screen which in this case was a computer screen. I feel like it was best suited to this edit that I have produced as it's the norm for someone to be viewing media in that form on their computers.