Some of these courses are very basic like "Cash Back". Others like the ones for the various editions of Microsoft Office Excel and Microsoft Office Access are more involved. By creating an account you are able to see what courses you have taken or are in the process of taking. Courses that are more involved have various sections and a challenge at the end of each section. What I like about the Microsoft Office courses are that they are not only offered for the current version but for several previous versions. It is not necessary to be using the current version to get instruction that is meaningful for you. For those who are beginners with regards to computers, their Computer Basics course is useful and informative. Most of their courses are computer related. Their Facebook page notes that they provide "innovative online learning opportunities to anyone who wants to improve their technology, literacy, and math skills."
You may wonder how are they able to do this for free. GCFLearnFree.org is supported by the Goodwill Community Foundation. GCFLearnFree.org serves to support the educational mission of the Goodwill Community Foundation which is "to create and provide education, employment, and life enrichment opportunities for people who desire to improve the quality of their lives" as per the GCFLearnFree.org site. It certainly is a good site to go to for your lifelong education.