@YTKoopaPlayer I’m no expert on this stuff so maybe somebody has some better ideas but I know that a lot of newer phones have a screen recording feature built in. I have an iPhone 11 for instance and I can screen record without having to download any apps. So look into that...if not then I’m sure there’s other screen recording software or apps that you can access.
As far as editing goes, I typically do simple edits on my phone just without any apps. When looking at a video on an iPhone there’s an “edit” option in the top right and that allows you to do a lot of basic editing including trimming your clip. You can always download other apps or go the route of sending your video to your email or something so then you can edit it on your PC. There’s a million options. But I would keep it simple if you can! Best of luck!