Hands down, Diahan Southard’s Endogamy & DNA online course is the best resource I have found for really learning how to dig into understanding endogamy, its impact on your autosomal DNA matches, and how to account for it when working those matches.
What can DNA testing tell you about your ethnic origins? How can it be used to piece together your family history? Are those TV commercials all hype? How have anthropologists and historians used this type of DNA testing to solve historical mysteries? Can these tests reveal anything about your health?
Yesterday I launched my newest research guide, on using DNA for genealogical research — a focus of much of my own research time and dime this year. The research guide is by no means complete. I am still scrambling to add more material, and will continue to regularly update it. It is meant to be comprehensive, but not exhaustive. Includes a special getting started section for beginners.