Gail Gaymer Martin is one of my favorite places to go for information about writing. You can find her at http://writingright-martin.blogspot.com. She has written information about almost any topic regarding writing. Just three of those I noticed were Characterization, Deep POV, and Common Writing Errors. There were many more topics to chose from. She writes in an easy to understand style that clearly presents the topic.
I highly recommend that writers check her site and sign up for notices when she
posts a new topic.