You may think that picking up a digital camera, turning it on, and taking the photo is all that you need to know about digital photography. Think again, as there is a whole heap more to learn that you might not even realise. Bakari Chavanu from Mac Photography Tips has combined his knowledge to produce an 8000+ word, 59 page PDF eBook.
http://manuals.makeuseof.com.s3.amazonaws.com/MakeUseOf_Guide_Digital_Photography.pdf