Keywords are the first (and, often, most skipped) step in your research. We can talk about the same issues using completely different words; if you only identify one of those words to search, you might miss some key research! Searches for a computer vs. a Dell vs. a desktop will get you very different results, after all. There are different ways to do this, with some outlined below to help you get started.
Concept mapping is just one approach to keyword development & brainstorming as well as the keyword worksheet.
Example from CUNY Guttman Community College
Use the worksheets below to create and use a constructive concept map for your own research topic.
Perhaps you generate your keywords (and alternate keywords) in the concept map. Or perhaps, you prefer to generate a cleaner looking list, like the worksheet below directs you to. If you have a research question already started, you can identify your keywords and come up with alternate words, or you use that research question to start a concept map.
It really is what works best for your brain! Just make sure you're coming up with multiple keywords and writing it down!
Identifying & Developing Keywords