It’s not as difficult as the length of my comment implies, and doing it in the terminal simplifies the explanation quite a bit.
The average user though might never need to use the terminal. Most of what they want can be done in the browser.
As for Linux mass adoption, that happened years ago. Just nobody noticed. Android, Chromebook, Steam Deck are all Linux based and MacOS (BSD derived) is a close relative. And Microsoft has even made it possible to run linux command line programs in Windows, with some caveats, using WSL. And that’s not counting the majority of servers, networking gear and space craft running linux or unix.