There's a lot of awkward assumptions towards the reader in this article - or I'm way out of the loop. Is it that hard to realize not everyone is working with a Mac and how is the transition to using ZSH a given!? Is there really anybody who used a gulp command without installing it beforehand?

All of this seems way too specific to give an unexperienced user a good overall understanding, I don't think this is an introduction I would've wanted.

Nice guide.

cd ~ command goes to home directory though, not root.

I wish someone showed me the UNIX operating system introduction by Kernighan et al before anything else. It can be found in AT&T arhives: https://youtu.be/tc4ROCJYbm0