Just completed one short course with 'FutureLearn'
Will probably do a second.
Just Finished 'From Soil to Sky' all online learning and interaction apart from taking a soil sample (which we got a friend to help us with.
There's a few related, run by FutureLearn, the Grow Observatory and Dundee Uni.
https://www.futurelearn.com/courses/grow-soil-to-food
Its fascinating stuff and makes you think more about how your growing/etc.. Folks from across the globe on the course, which is always fascinating.