I have more experience with traditional genealogical research than with genetic genealogy, but I am learning more about using DNA testing in conjunction with documentary evidence. Roberta Estes' blog DNAeXplained (http://dna-explained.com/) is a helpful resource for learning about the use of DNA testing in genealogical research.
Roberta blogs about the following topics: General Information, Basic Education, Introductory DNA, Intermediate DNA, Advanced DNA, Examples, Educational, Entertainment, and Project Administration. Items that are no longer really relevant are categorized as Historical or Obsolete. More specific categories are listed on the right side of the page, so it is easy to browse through the posts on a particular topic.
I even found a post that mentioned my 7th-great-grandfather Edward Lucas!