Researchers usually face many difficulties in conducting a research, mainly because on the one hand they are not familiar with the philosophical foundations of the main paradigms used in educational research (quantitative, qualitative or mixed) and on the other hand, they are unfamiliar with the relevant types of research. These paradigms are not related. These methods determine not only the formulation of the problem chosen for research and the related research questions or hypothesis, but more importantly, the sampling method, the selection of appropriate research tools, the way of data collection and also the data analysis; Therefore, knowing the types of research methods and the characteristics of each of them, as well as understanding the difference between quantitative, qualitative and mixed research, helps the researcher to choose the right and appropriate research method, and it is necessary for researchers to be fully familiar with these topics. Therefore, in this research, with the aim of investigating the basics and methods in multidisciplinary research, by distinguishing between quantitative, qualitative and mixed research, the explanation and definition of qualitative and quantitative research, the difference between quantitative and qualitative methods, the explanation of mixed methods and ethical considerations in all researches have been discussed. Researchers can choose the best and appropriate path for their research and be better and more successful in collecting the data needed for their research.