Yeah, because photography is all about the numbers and settings, and not at all about how you use them. Why don't people try learning from real life experience behind the camera, developing your own eye and knack for the settings, rather than studying a sheet of numbers and diagrams? I hate this.
dslr lenses- get to know all about telephoto, prime lenses, wide angle and kit lenses! Which to use for faces, which to use for places, and everything in between. (great info for beginner photographers)