In class we used Google Jamboard to brainstorm keywords, but there are no rules to concept mapping. The main objectives of mind/concept mapping are to identify patterns and connections in what you already know, to begin developing a list of search terms, and to identify aspects of your topic that need to be refined.
This video demonstrates how to brainstorm keywords (search terms) for systematic searching.
If you get stuck brainstorming Search Terms, there are a number of techniques you can use to increase the variety of keywords:
The way you enter and combine terms matters. In addition to brainstorming keywords, think about how you might enter or combine terms to create highly specific search queries.