C Can you give examples of each?
First, if I remember correctly, Law School Confidential does a pretty good job of explaining what the different kinds of study aids are.
Second, Gilberts and Emmanuals are the two main brands of commercial outline. I can't really explain what they are, other than they are in outline form (and if you don't know what an outline looks like, then I think you may need more help than LSC can give). An example of a Hornbook is Chemerinsky's Constitutional Law book (not the text book he authored, but the other main book he has). It's an actual book (paragraphs and all), but unlike the case book that teaches the law through cases, a hornbook just explains the law.
I suggest that you go to your library and ask if they have study aids available. If they do, check a few out and go sit down with them for a bit.