Out of curiosity, when my coding instructor for Python did some commands on his computer, he told me learning any sort of terminal command interface (e.g. GNU Bash, PowerShell, Zsh ) will make me understand systems and how computers work and would make me know the basics of systems programming (although I am more into web development). I immediately went curious, out of my time, and looked up some command line interfaces to learn. It gave me bash, shell, zsh, powershell, etc. All these are really confusing, and they all seem the same. I want to be a terminal dweller, so which of the terminal related things should I learn? I think Bash, since it can replace Powershell on Windows, and has all the Linux/macOS systems.