Global Genes Rare University is rolling out a new online course aimed at helping rare disease patients and families understand the world of genetics. The course, which is free, starts with the basic genetic concepts for rare disease, and them moves to family and heredity, genetic testing, and scientific advances. We spoke to Holly Snyder, a lead editor on the Rare University genetics course and senior genetic counselor at Illumina, about what rare disease patients and their families should understand about genetics, genetic testing, and why genetic literacy matters.