On the Nimitz Library Home Page, follow the red arrows as shown below, using words describing what you are looking for.
Let us help you find books on shelves if you are new to this system.
Reference sources, like encyclopedias, are good first steps to understanding a topic. These are a few that might be helpful more generally, but you can also utilize the Nimitz Search to bring up specific entries in reference sources. Just search for your topic and limit the results, using the filters on the left, to select only Reference Entities under the Content Type filter.