I think it runs on el capitan. Would I be able to run a Linux OS on it if it's not able to upgrade? Not too worried about time. We graduated in 2010 so I don't mind waiting a little longer haha. I'd like to contribute but if it's not going to be powerful enough to actually make a difference what would you recommend?
Bitcoin Core 0.21 dropped El Capitan support, you now need Sierra or newer to run it.
You can dual-boot Ubuntu on that Mac though if you install the rEFInd boot loader and follow these instructions: https://www.maketecheasier.com/install-dual-boot-ubuntu-mac/
Thank you for this!!