Mixed Surface
Mixed surface driving is even more challenging than race tracks in many ways, and arguably much more fun! People often imagine rally driving is all about sliding sideways, and forget the fundamentals such as apexing and corner exit speed.
Mixed surface presents unique challenges such finding the grip line in addition to the racing line, finding ruts to help cornering speed, and using weight transfer to your advantage.
I currently instruct on dirt, gravel and snow with Race Lab.