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https://writing.colostate.edu/guides/page.cfm?pageid=1368&guideid=64
What are the advantages and disadvantages of experimental research? This link takes you to a clearly laid-out table summarizing the potential benefits and shortcomings of this approach to research.
http://libguides.usc.edu/writingguide/researchdesigns
This page by the University of Southern California Library describes different types of research designs in simple terms. For each type of design, the page specifies its definition and purpose, what it can be useful for, and what it cannot achieve in terms of research potential and scope.
http://www.e-ir.info/2014/07/05/the-advantages-and-limitations-of-single-case-study-analysis/
This essay, written by an undergraduate student and published on the E-International Relations website, discusses the advantages and limitations of using case studies when doing research. It is clearly structured, accessible, and it includes a list of useful references on the topic.
https://www.youtube.com/watch?v=IsAUNs-IoSQ
This short video gives a general and quite useful overview of the differences between qualitative and quantitative research.
http://www.nytimes.com/2014/10/29/upshot/professors-research-project-stirs-political-outrage-in-montana.html?_r=0&abt=0002&abg=1;
https://thewpsa.wordpress.com/2014/10/25/messing-with-montana-get-out-the-vote-experiment-raises-ethics-questions/
These two articles discuss the ethical implications of a research project carried out by two academics from Stanford University and one from Dartmouth College, in the US. The political scientists carried out an experiment by sending out leaflets to Montana citizens presenting the political views of candidates ahead of the local judicial election, which is supposed to be a non-partisan electoral competition.
https://www.youtube.com/watch?v=BQeUuxIzsfU
This is a video from a lecture given by Graham R. Gibbs on the ethics of social research. It discusses the basic principles of ethical research, and some of the most important ethical dilemmas researchers face during their work.
https://guides.lib.vt.edu/researchmethods/design-method
This method guide from Virginia Tech University gives a brief explanation of the difference between research design and research methods. There is also advice on how to select the methods best suited to your research question and design.
https://www.questionpro.com/blog/research-design/
This article gives an overview of the purpose, characteristics, and main types of research design.
https://www.scribbr.com/research-process/research-design/
This article provides a useful guide to how to create a research design, including the practical questions you will need to think about as you make decisions and develop your ideas.
https://library.sacredheart.edu/c.php?g=29803&p=185902
This guide from the University of Sacred Heart library outlines the key elements that all research designs usually include, and introduces different types of research design and what they can or cannot tell us. This might be useful for thinking about what kind of research design is best suited to the topic and question(s) you are interested in.