So here is the plan, I want to make something like this:
but in order to do that I need to use sound keys (which I have) and I don't know how to use it very well so please keep it simple when replying.
So with sound keys, I can make rectangles move to the beat of music like in here (no they do not use the audio spectrum in this vid and duplicate it, so hear me out) they make solid layers of rectangles and make them move up and down to the beat of the music using ranges, I know what the ranges I need to use are in sound keys, but I do not know how to make the scaling work correctly. When I hook up the rectangles scale with the music, it moves both sides, people have said you need to move the pixels rather than the scale, so how do I do that, also when I hook it up it ends up being extremely small (the rectangles) so I need help solving these two problems, so please help me, remember I am a noob and have no idea how to use equations and stuff. Thanks!
You need to move the anchor point for your rectangles to one side or the other so that, when they scale, they will only appear to move in one direction.
If you're a "noob", you should really start here: Getting started with After Effects. The resources in that link will get you started in a way that will make you able to come up with this stuff on your own.