I have recently participated in a DNA online class that was outstanding! Actually, I took the class twice. It is quite the time commitment, but the depth of learning going on is worth the time spent!
It was so good, I felt you needed to know about it as well. I learned methodology; how to use the tools at 23andMe; ftDNA; GedMatch and more. Again, it is a time commitment. These lessons take hours. In the class I participated in a member of my class was able to discover both of the parents of an adoptee, and their siblings were located as well.
If learning more about DNA is on your bucket list, I highly recommend this class. Working with autosomal DNA results.