Look and Feel: 

• Modifying the bashrc file: create aliases, and behavior of shell
• Shell color coding: change the colors on the bash shell
• Key Shortcuts: All the alternative key combos and what they do

Scripting: 

• Header: What needs to be at the top of all bash scripts
• Usage Statement: have the script explain how to use it if you enter the wrong arguments or "-h"
• Grab Arguments: how to easily grab all the data from arguments passed to the script
• Use lines in a file for variables: Using While Loops to grab lines from a file
• Function: create a function in bash, and call it.
• sed/awk: Auuughhh!!!
• Command output to a variable: 
• Running commands in the background: poor mans screen.