Research methodology is the specific procedures or techniques used to identify, select, process, and analyze information about a topic. In a research paper, the methodology section allows the reader to critically evaluate a study's overall validity and reliability. The methodology section answers two main questions:
Finding a research design strategy is similar to the research process as a whole. First, locate general information on research design and methodologies, then gain background knowledge on the methodology you feel would most appropriately address the type of data you will be collecting, and finally, choose a methodology and test/measurement to use in your research.
Source: Research Methodology : A Practical and Scientific Approach, edited by Vinayak Bairagi, and Mousami V. Munot, CRC Press LLC, 2019.
There are three types of research methods: qualitative, quantitative, and mixed methods. There is a third research method that has been widely used, mixed methods research. Here is a video that helps you understand the different research methods as well as choose one for your project.