The answer is the "code check" series of books. They rock. They are inexpensive, available on Amazon, and are the way to go for quick, easily absorbable information. Just figure out what version of the code your local authority is using, which is typically going to be determined by what year they are working on, like the 2009 or 2012 IRC, or whatever set of rules. Then get the code check building, and electrical, and you are good to go. I guarantee you won't regret the purchase.
Not only are they reliable and easy to understand, they are often considered the bible by inspectors out in the field. More than once, while discussing a point, I have had an inspector ask if I took a look at what Code Check had to say on the issue.