Although our main focus is on tracing ancestors based on research of the vital records, if you are interested in tracing your roots with use of DNA testing, please check the following resources
https://www.legalgenealogist.com/2016/05/01/those-percentages-revisited/
DNA Color Clustering: The Leeds Method for Easily Visualizing Matches
Improved AutoCluster clustering on GEDmatch by Patricia Coleman https://patriciacolemangenealogy.com/blog/
Genetic Genealogy using GEDmatch - An Absolute Beginners Guide by Jared Smith
Tips for Using GEDmatch by Louise Coakley
https://www.crigenetics.com/blog/curious-research-information-who-are-the-polish-people/