Encyclopedias are catalogs of topics. Just browse through and pick one!
Subject experts have condensed it down, usually to one or two pages. Or would you rather read a 900-page book?
Encyclopedia articles mention and define search terms you can use in database searches (concepts, names, processes).
Encyclopedias acquaint you with the broad outlines of the subject---sometimes saving you from embarrassing errors!
Sourced from http://guides.lib.purdue.edu/encyclopedias
Welcome to Britannica School, a safe, up-to-date, and age-appropriate information resource for Elementary, Middle, and High School. Discover encyclopedia articles, multimedia, primary sources, games, and other learning resources that support student research and reinforce curriculum standards.
https://galesupport.com/novelGeo/novelGeoLink.php?loc=nysl_ca_tamarac&db=EBschool
For middle school through college-age students and adults. Integrates primary and secondary source databases plus e-books in a single search.
For middle school thru high school students. Includes the 22 vol World Book Encyclopedia, historical features, maps, editor-selected websites, full-text magazine articles, audios, videos, animations, United States and Canadian province links, an extensive dictionary and an atlas.
For beginning Spanish-language students.