E&E books are not hornbooks. They are a textbook-like books that cover the basic concepts, rules, terminolgy, etc. with explanations and various examples. They also include questions to test you with and answers. They are geared for the student. Hornbooks cover the topics in much more depth and are really geared for advanced students and practioners; students might use them to clarify things or for a more indepth understanding of a specific topic.