The provided content discusses three types of research studies: qualitative method, experimental study, and case study analysis. The qualitative method is used to conduct surveys related to motivation, opinion, and other non-measurable aspects. Experimental studies are conducted in the field of science using laboratory experiments to determine cause-and-effect relationships. Case study analysis is an important material used in the research method theme, serving as a primary resource for in-depth analysis. The content also references various academic articles and books that support these research methods.