"Evidence law governs the process of proof at trial, in effect taking up where rules governing civil and criminal procedure leave off. For the most part, evidence law puts in place a set of restraints that courts enforce against lawyers in an attempt to manage the various risks and opportunities that the trial process presents in an adversary setting." (From Evidence: Practice Under the Rules.)
Hornbooks are concise one-volume legal treatises, written primarily for law students on subjects typically covered by law school courses.
CALI lessons are interactive tutorials written by law professors at CALI member schools. They can be used for studying topics in evidence, including relevance and hearsay.
Ask a Reference Librarian for the GW Law CALI code.