I never took a single creative writing class in college, so I had to learn where I could. For me, that meant online. These websites taught me most of what I know:
http://www.writingexcuses.com/ – A podcast by Brandon Sanderson, Howard Tayler, Mary Robinette Kowal, and Dan Wells that covers all things writing. Listen and learn!
writeaboutdragons.com – Free videos of Brandon Sanderson’s writing class at BYU.
gailcarsonlevine.blogspot.com – A blog about writing by Gail Carson Levine.
http://www.hatrack.com/writingclass/index.shtml – Essays on writing by Orson Scott Card.
writerunboxed.com – A blog by various authors about the business and craft of writing.
queryshark.blogspot.com – A blog by literary agent Janet Reid about how and how not to write a query.
http://misssnark.blogspot.com/ – A writing blog about everything from first pages to querying.