Website for the U.S. National Archives and Records Administration. It provides useful information about searching for government records held in the U.S. The "getting started" page gives a detailed outline about how to use archival records in research. There are definitions of archival terms some of which are different from Canadian archival language
While no longer in use, this guide from the Library and Archives Canada is designed to introduce new users to the customs of archives. The section on planning a research strategy is a brief, but useful summary of how to go about performing research using both primary and secondary resources.