Make a USB live boot disk?
I don't know how to do that.
I installed a chrome extension, basically it's the chrome os installer", and followed instructions.
Also, thank you all for caring, but I'm not interested in linux. Or, I'm not interesting in finding replacements for my most used apps and learning to use them. For example when when my previous version of Photoshop stopped working, I tried GIMP. I could do stuff, but I never really liked it, so I found a newer version of Photoshop that did work. I can get stuff done instead of figuring out where everything is and workarounds that don't get me quite the same results.
This Mac is ok "most of the time", not perfect but it's from 2014, with 4GB ram, and a spinning hard drive (and I'm lucky to have it, thanks again Ribtor). Maybe linux would feel faster, but having to relearn everything outside a web browser would slow me down more, at least for awhile, I think.
I got to run a non-apple OS on 3 different Macs. That's what this thread is all about.