Most of us don't do too much touring during the winter, unless we're fortunate enough to get away from the the miserable weather for a few weeks, or unless we opt to brave the wintery conditions and tour in them.
The winter is my time of year to take courses ... further education. Some years I might take a single night course for a few months over the winter. Other years I might be engaged in full time education (like this year, for example).
But many of these courses could be related to touring. For example, most winters in recent years I've taken a spinning class or yoga class. These help keep my fitness level up over the winter so I'm in shape to tour in the summer. Last winter I took the classes toward a Fitness Trainer Certification. I didn't manage to get the practical part done in time for various reasons, so I'm not certified, but I still passed the two, rather intensive, courses on aspects of fitness, health, and nutrition with flying colors. And the information from those classes has been beneficial for both my long distance cycling, and touring. I've taken two bicycle maintenance classes to familiarize myself with some of the basic repairs I might encounter on the road.
Since I started University, I've taken several classes that could also be related to touring ... Kinesiology (another 'health and fitness' class), Physical Education, French ... and this semester, I'm in a Social Studies course with an emphasis on global citizenship, a Canadian history course, and two Anthropology and Culture courses learning about the cultures and languages of people all over the world. Very interesting.
Do you take courses with the intent of enhancing your tours, or which have indirectly or unintentionally enhanced your tours?