My own blogposts about DNA.  Effectively, these form a short introductory course in three stages.  If you’re an absolute beginner, be sure to read them in this order.

Part 1: How autosomal DNA testing works for genealogy.
These first five posts aim to give you enough information to decide whether testing is for you.
Using DNA testing to develop your family research
DNA: unexpected test results
DNA testing: ethical considerations
DNA: Asking other family members to test
DNA for genealogy: where to test

Part 2: The practicalities of making the autosomal DNA testing work for you.
So your DNA results are in? What now?
Thrulines and Theory of Family Relativity
Proactive strategies for engaging with your match list

Part 3: Chromosome browsers and chromosome mapping.
Chromosome browsers and chromosome mapping
DNA Painter
GEDmatch

Other posts focusing on or including using DNA for genealogy.
Deep ancestral DNA testing – a general introduction to Mitochondrial DNA testing and Y chromosome DNA testing.  This was the first DNA post I wrote and covers how I first became interested in genetic genealogy.

Will the real Edward Robinson please stand up? – outlining how, after a 25-year search, I was finally able to use DNA to break down a brick wall.

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Other very useful links and resources

The Shared centiMorgan Project chart version 4

Shared centiMorgan Project – download PDF outlining latest research, March 2020

The Genetic Genealogy Standards (2015)

International Society of Genetic Genealogy: a non-commercial, non-profit organisation whose mission is to advocate for and educate about the use of genetics as a tool for genealogical research while promoting a supportive network for genetic genealogists.

International Society of Genetic Genealogy glossary of terms used in DNA.  You won’t ever need to look up most of these!  But if you ever do need to understand a term, this is a good place to start.

The Genetic Genealogist – Blaine T Bettinger’s website

The Genetic Genealogist DNA Central – Blaine T Bettinger’s YouTube Channel

DNA explained: Genetic Genealogy: discovering your ancestors, one gene at a time – blog by Roberta Estes, scientist, writer and speaker about genetic genealogy

Your DNA Guide – Diahan Southard’s blog

My favourite DNA books
Affiliate links take you to Amazon UK

Blaine T Bettinger: The Family Tree Guide to DNA Testing and Genetic Genealogy

Graham S Holton (ed.): Tracing Your Ancestors Using DNA: A Guide for Family Historians