Online learning provider udemy offers thousands of courses. Courses are available on-demand 24/7 via web browser, iPhone, iPad and Android. Many offer lifetime access.
udemy offers a number of courses that are interesting to homebrewers, including beer and brewing related courses (includes Brew Real Beer, Beer Making 101, Beer and Cellar Management, I brew-U brew and more), Wine (Become a Wine & Wine Pairing Expert, Becoming a Wine Connoisseur, Wine 101, Home Wine Making for Complete Beginners and More), Biology, and Chemistry
As of this posting, udemy has a $10 New Year Course Sale with many courses marked down to $10. Check udemy for up to the minute price and availability.