Here's how to make boutique 808s in Garageband
Here's how to mix a song using Garageband's interface
Here's how to write a simple song using Garageband.
A thorough explanation of EQ and how to use it in Garageband
An article explaining how to simply mix vocals using Garageband.
Here's a list of some of the basic items that you need to get started with music production.