I’ve started a fascinating class in historical fiction, for readers or writers, through Coursera. It’s called Plagues,Witches & Wars: The Worlds of Historical Fiction. It’s free and offered through Coursera by the University of Virginia. I’m just in week 2 and am learning about the roots of historical fiction.
The professor is knowledgeable and the lessons for each week come in 10-20 minute lengths, perfect for little gaps of time.
If you want to learn about a particular subject, you can browse Coursera, which has lots of courses in all areas. Some you must pay for and some offer a certificate if you pay.
Let me know in the comments if you see something interesting and sign up for it.