Books offer in-depth coverage of a subject, overviews of a big topic, and background information. Academic books are often a collection of essays or have distinct chapters on specific aspects of the topic at hand. Use the Table of Contents or the Index of a book to find the book chapter that fits your needs.
Use Omni to find print and online books.
Reference works like encyclopedias and dictionaries are helpful for getting familiar with new topics and understanding key terms and concepts.