This repo contains linux commands, bash scripting theory and bash scripts that I have been using to learn and practice.
Some useful links:
https://ryanstutorials.net/linuxtutorial/cheatsheet.php
https://ryanstutorials.net/linuxtutorial/cheatsheetgrep.php
https://ryanstutorials.net/bash-scripting-tutorial/
Essentially a process is a running instance of a program.