Credo Reference is an online collection of dictionaries and subject encyclopedias to help you discover background information on a topic. Sources like these provide overviews of topics and descriptions of concepts and ideas. They can also provide definitions, statistics, and other details. You can use this type of source to help narrow your research topic, find data to support your thesis, and identify keywords and main ideas to use as search terms.
Along with JumboSearch, databases like Academic OneFile allow you to search simultaneously across many subjects and narrow your results to different types of resources, including scholarly peer-reviewed articles. If you're getting too many results from JumboSearch, use Academic OneFile to get started with a more targeted search on your topic.