MacOS/Windows/Linux
There are three dominant operating systems for non-mobile computers: Windows, MacOS, and Linux. You’re probably familiar with the first two, but not the last one (unless you’re an engineer, but then why are you here?).

There are three dominant operating systems for non-mobile computers: Windows, MacOS, and Linux. You’re probably familiar with the first two, but not the last one (unless you’re an engineer, but then why are you here?).