Hello There
I have been scourging the internets for a way to do this and am having trouble. My goal is to have a [somewhat, at least] sleek vertical menu with sub categories. I've found a few simple examples but would like to do this from scratch because I am very picky. Could anyone recommend me some tutorials that show the basics of doing so. An example of what I am looking for is the vertical menu on the ikea website, where you click on products, and the sub categories are shown below.

to make this more interesting, I'm only a beginner in this web design stuff, so the more information, the better.