Every craft, field or business has its own language, skill set and tools, and writing is no exception.
Here are a few of the resources I always have on hand when writing:
– The AP Stylebook
– Webster’s Dictionary (yep, the real thing)
– The Fire in Fiction by Donald Maas
– Thanks, But This Isn’t For Us by Jessica Page Morrell
(these last two I thumb through off and on to make sure I’m paying attention to details.)