Regarding "Any tip to share?": Start with a reason, not a data source. That is, what question(s) are you hoping to answer, or what hypothesis do you want to tes

Regarding "Any tip to share?": Start with a reason, not a data source. That is, what question(s) are you hoping to answer, or what hypothesis do you want to test? Let the questions lead back to what few things are useful to track and how to track them.