You have a Mac and do music but do not know how to get the most out of GarageBand?
I have been using GarageBand since the first day it came out. I have done demostrations in Apple stores with midi guitar and Garageband.
I have been doing computer recording for 10 years.

Make your own recordings. Create your own loops. Add more loops and sounds. Record with the software instruments. Add original music to your home movies!!

I started to offer GarageBand lessons and noticed that clients didn't have the computer setup with the right OS, memory, hard drive and so on. So the first action was to upgrade and offer tech support in this area. I end up helping getting the right hard drives, memory, interfaces and installing them. I use utilities to clean up the internal hard drive to get more space so it will work better. I am mainly doing music but what I do helps the computer in general and is good for video and pictures.