This infographic/cheat sheet from Zippi might be helpful for those looking to get out of auto mode and gaining more control over their cameras. While section 1 is much more for those shooting with film the rest is relevant for digital photography.
Trick, Photography Book - Cheat Sheet: 3 Elements of Exposure - Digital Photography School -- - Now YOU Can Create Mind-Blowing Artistic Images With Top Secret Photography Tutorials With Step-By-Step Instructions!
Take Harvard's Online Course in Digital Photography for Free
Depth of Field: The pictures above change the aperture setting of the camera lenses, creating a sense of depth in their images. The larger the apertures (smaller F-stop number) and closer the focusing distances, the shallower depth of field is. Other exam