For every “core curriculum” law school course, there are no less than five different supplemental study guides to accompany the course. For virtually all required classes, you can usually find hornbooks, course outlines such as Legalines and Emannuel, case briefs from Casenote Law Outlines, law summaries from Gilbert and Black Letter Series, in-depth explanations from Examples and Explanations, and overview of the subject from the Nutshell Series.