Untangling the Terminal: How to master the macOS command line | Macworld
Very useful shortcut: Cmd+tab is a common shortcut to move focus between applications but you can set cmd+§ to move focus between one application's windows. I have used this for five years
How To Open the Command Prompt on a Mac
How to use Terminal on Mac: Basic commands and functions
How to install command-line tools on a Mac | Red Hat Developer