Many people could start from here..,
This review is from: Simply Digital Photography (Paperback)
Customer review from the Amazon Vine Programme (What's this?)If you're fairly new to digital photography, or even if you're not, this book will be a very good guide for most of the people who use digital cameras.
It begins with definitions, such as 'JPEG', and how to use the SD cards and so on, which will be great for absolute beginners, and DSLRs, lenses, and a guide to photo editing software, Photoshop. It shows the technique of how to use digital cameras in different situations, which, unless you've already been to a photography course and already know how to use DSLRs with a manual mode, would be a very good guide for up to intermediate users.
It's always good to go back to basics, so I'm glad I got it!
Hope it helps.