A terminal app is a standard way to work with a computer via a text-based interface. Oftentimes, a terminal app will run a shell as soon as it's launched. A shell is a program that takes commands from the keyboard and gives them to the operating system to perform.

As of 2023, Mac OS computers run Zsh shell by default when launching the terminal app.

One of the first things I recommend installing, for anyone who will often be working in Zsh on Macs, is https://ohmyz.sh/ - an open-source framework that upgrades the Zsh UI and comes bundled with many helpful functions.

To install oh-my-zsh, simply run the following command in Zsh:

sh -c "$(curl -fsSL https://raw.githubusercontent.com/ohmyzsh/ohmyzsh/master/tools/install.sh)"