JavaScript

Javascript can be a great way to learn some cool programming tools (  like extensions – http://lifehacker.com/264490/how-to-build-a-firefox-extension/all )

To learn JavaScript check out one of these websites:

CodeCombat (learn through playing a video game) – http://codecombat.com/
Code Academy (learn through 16 tutorials) – http://www.codecademy.com/en/tracks/javascript

As you learn any programming language look for these 5 concepts: functions,  conditionals, loops, variables, and events.

OR Another good idea is to work through all the tutorials on this page:
http://www.pageresource.com/jscript/

OR learn it through W3 schools:
http://www.w3schools.com/js/default.asp