I am sorry if I dont understand. What is this link about? Courses, video tutorials? articles? I understand it has something to do with geometric algebra and that is about it. Can someone shed some light with all the visualizations on the home page?
It is a collection of resources about "Geometric Algebra". It is basically a vector space equipped with a anticommutative product. Turns out that this formalism is very useful in elegantly representing a number of operations (like rotation) in the domain of physics or computer graphics.
The third video in the "Featured Introductions" section near the top of the page, called "A Swift Introduction to Geometric Algebra", is a very good starting point.