I went through this one just for kicks and giggles. It's not very comprehensive and just covers some of the most basic elements of writing fiction. I don't see it as a waste of time, but it may be better suited for those who have very little if any formal instruction. If the goal is something more indepth than what Futurlearn offers there will also be a price tag involved.
"Start writing fiction" MOOC
Free online fiction writing course