If you're looking for a new online photography resource, be sure to check out Photodoto! This website offers courses, eBooks, and articles that are designed to help you improve your photography skills. The articles posted on Photodoto cover a wide range of topics, from how to adjust your exposure manually to how to prepare for the "real world" as a freelance photographer.
These "Tips and Tricks", as Photodoto notes, also offer help in regards to post-production. If you're interested to learn about HDR photography, Photodoto has a great article on that topic. If you're interested in learning why a photograph should be black and white vs. color, Photodoto can help shed some light on that as well. There's also a section that can help you choose out the right photography gear that suits your own budget!
"Photodoto." Photodoto. N.p., n.d. Web. 10 Feb. 2015.