A."Developing a Research or Guiding Question"(by Arizona State University): This video will help you understand the difference between a topic and a research question. It will also help you develop good research questions.
B."Generating and Using Keywords"(by Arizona State University): This video explains how to determine keywords/concepts. It also explains the importance of finding synonyms or related concepts.
C. Watch "Boolean Logic" (by Pfaul Library"): This video explains how to combine search terms to narrow or broaden your search of library databases.