Concept Mapping is a visual way to explore a research topic and can help you narrow a broad idea into a more focused topic. By brainstorming what you already know about a topic, the questions you have, and more you can outline areas you need to do further research in and start making decisions about how to narrow your topic down.
Concept mapping can also be called a bubble map or mind map, but they don't have to look a certain way. If you prefer a less visual style, your map can also be a bulleted list. Use pen and paper to draw your map or try a digital tool like Lucidchart, Bubbl, and Popplet out to easily make a concept map.