If you want to build a background removal tool from scratch that’s a project of its own. This shows you how to very simply remove a background with a pre-existing tool that other people have spent the many hours to get functional so you can do the five-minute tutorial.
It’s not the Arch Linux way, it’s more like the Ubuntu way.
What do you mean? You don’t write your email in your IDE and lint it before copy/pasting it into Outlook (or email client of choice)?