Bash scripting

Bash Guide for Beginners
https://www.tldp.org/LDP/Bash-Beginners-Guide/html/Bash-Beginners-Guide.html

Match command-line arguments to their help text
https://explainshell.com

Commands And Arguments
https://guide.bash.academy/commands/

Bash scripting cheatsheet
https://devhints.io/bash