Online resources I am enjoying:
This is a series of classes by Brandon Sanderson, teaching a one semester class on writing Science Fiction Fantasy writing at Brigham Young University. These are very well done and give a great, progressive overview of writing in this genre.
Creative Penn - Joanna Penn - resources for writers - many books, pages, blogs, podcasts on all aspects of writing books. It would be overwhelming if not taken a bit at a time, but it is divided up so that you can find details on individual topics of interest.