Check out my new Android app called Find Your First Linux distro. That old PC still has value. This app helps you select your first Linux distro based on the specs of your PC.
You'll be pleased to see that Linux Mint Main Edition and Linux Mint Debian Edition are two of the three distros I recommend. The third is antiX Linux for the old clunkers. Then there's the museum display option for the computers from the Windows 95 era.
Find Your First Linux Distro is available for free at
https://play.google.com/store/apps/deta ... irstdistro