For people interested in this topic, here's a good set of slides going over Grassman/Clifford/Geometric algebra concepts: http://www.terathon.com/gdc12_lengyel.pdf
And another good site: https://mattferraro.dev/posts/geometric-algebra
And another good site: https://mattferraro.dev/posts/geometric-algebra
and ofcourse the go-to reference https://bivector.net
or join 1000+ profs, researchers and enthusiasts on the bivector discord here https://discord.gg/vGY6pPk