Below are a few relevant Library of Congress Subject Headings. These can help you in finding basic guides, manuals and historical methodology books in our Local Catalog.
The difference between these and "tags" you may have experience is that the Library of Congress controls what terms, spelling, etc. are used. This standardized vocabulary helps organize words and phrases in predictable ways.
For instance, searching for "Civil War" as a keyword, would find many references to events involving the concept of "civil war" in various countries. If I only wanted to find information related to the United States civil war, I could use the subject heading
The design of this page was partly adapted from Research: By Course, Subject, or Topic, by University of Arizona Libraries, © 2020 The Arizona Board of Regents on behalf of The University of Arizona, licensed under a Creative Commons Attribution 4.0 International License.