One great thing about the internet is the number of people offering advice. Of course, sometimes you need to take that advice with a grain of salt, but photography advice is usually safe. Case in point; BBC’s Wildlife Magazine published a series of Photo Masterclasses in 2006/2007. The information still holds true now (theory rarely changes) and is definitely worth a read.
As a photographer myself, I’m constantly trying to find information of new techniques and practices to make my photos better. That’s why I love it when an organization like the BBC shares information like this on the ‘net. The classes cover the best practices for shooting in many different situations, including everything from shooting plants to shooting in the arctic. They are all available in the PDF format, and you can download them for personal use. I’ve only had time to read a couple of them, but they are very well written and worth your time.