Regardless of whether you are a newbie or seasoned pro you can find some good information here. This resource, put out by the Naval Safety Center, gives great tips on a wide range of subjects that are of value to writers. Here are some titles of the individual pages:

• How To Tell A Rookie Is At The Keyboard
• To Cut Or Not To Cut
• What Makes A Photo Effective
• Making The Most Of Verbs

Although this is geared for writers who work for their publications, it offers terrific advice!