Do you know about Futurelearn?

Futurelearn is a network of UK universities offering free online courses, and there is one coming up on Moons starting on 17th March, for 8 weeks - they estimate about 3 hours of study a week. 
Each week a series of lectures and/or articles is put up on the web, and you can access as and when you choose.  There is a quiz at the end, but there is no requirement to do this - or indeed to do any parts that don't interest you.
Visit the website for more information