I'm using a couple of machines, Mac, Ubuntu, and Raspberry Pis and all of them have at least 3 aliases. In addition, basically, I use zsh since I love oh-my-zsh.
If you are not familiar with alias, this post will be useful.
Sometimes I change settings, but I don't want to type source blah blah blah.
alias reload="source ~/.zshrc"
I use this heavily, especially to check ssh destination lol
Love to keep my iTerm screen clean as much as possible
Sometimes I do typo like
pythoo, so this is to run my python scripts smoothly.
I also put aliases for my python virtual env since I'm lazy.
For Ubuntu and Raspberry Pis have
open which Mac uses.