I would generally encourage you to consider what discipline(s) you expect to be researching within (are you going to be doing AI research? historical research? economic research?) and learn from the research methods that are common for researchers in that field.
I would generally encourage you to consider what discipline(s) you expect to be researching within (are you going to be doing AI research? historical research? economic research?) and learn from the research methods that are common for researchers in that field.