when i started the sport, I took a lesson, I read every article online i could find, joined a few forums, and sailed every week. Then i met good sailors and sailed with them. There were plenty of resources for someone who really wants to learn.

PS i think cat sailing is in decline mostly due to the barriers to entry into the sport (equipment costs, equipment tranport) and other sports that have lots of thrills, and no equiipment to tow