Synonyms make your list of keywords longer. More keywords = better searching = more results. Look at the example below to get an idea of how synonyms can broaden your understanding of a given concept:
Many library resources offer the option to combine your keywords using AND, OR, & NOT. This can also be useful when searching online. Use quotation marks to search for a name or phrase.
This brief video (0:59) from the University Library at UNC Greensboro explains how to turn your research question into useful keywords.
If you would like more practice with keywords, check out the rest of their tutorial!