Learning even just the basics of photography takes a bit of work and one of the more complex ideas is the relationship between ISO, aperture, and shutter speed. German photography blog Photoblog Hamburg has a graphic explaining how it works.
ISO cheat sheet - improve your blog photography
Senior picture idea? @Myra Cherchio Cherchio Cherchio Brickler is that you?! that looks like your butt!
10 photography tutorials you need to read
10 tips for great pictures includes some of the basics and few advanced tricks and tips which make the Photograph usually better.