First Tech Assignment

So, as you can tell from the title, this is my first assignment in tech class. One of the things I hope to accomplish in this class is how to use Garage Band better. I have used this a few times at my house, but I was pretty much guessing on how to use it and I didn't really understand what all the tools do. I want to find out how to record music on this, since that is basically the main function of the program, because the first time I tried it, the sound turned out bad.I want to know how to fix this and how to use other parts of the program, and I guess this will help me with other projects in the future.