I put together a fast livery tutorial that attempts to quickly explain some of the basics of every aspect of the painting process. Not a deep dive into how to actually paint, more of a tips and tricks guide that goes through getting templates, how to use them and their parts, exporting them and manipulating materials. Hopefully it helps a few people out. Right now it's just Photoshop but I'm hoping to do branch videos that look at GIMP, Photopea and Paint.net.