Photoshop here I come!!!

I have completed two photoshop classes. So far we haven't gone over much of anything so I am becoming a bit antsy. I have a feeling that this is not going to answer many of my questions about how to make my photos outstanding, but we shall see. The other problem is that the college is having the class taught in PS-CS3, when CS4 is now the latest and greatest version. I don't really get how or why they would do this. I did however get CS4 on my computer so I am ready to go. Pretty crazy all of the fun things you can do with it. I hope I can catch on quickly.