The trivium consists of grammar, logic, and rhetoric, while the quadrivium consists of arithmetic, astronomy, music, and geometry.
The overall idea here is to get to a unified idea of reality.
To take a quick look, this site is helpful but mostly US centric. http://www.triviumeducation.com/
So, let us know which parts of the Trivium and Quadrivium you feel like looking into for your adult education. Of course, if you are homeschooling, there is no better than the Trivium and Quadrivium.