I hope I can explain this correctly and someone knows what I'm talking about. I've noticed here that people who learned photography very early on and in its most basic form seem to know things that those of us (or some of us, anyway, lol) who studied it on our own later in life take longer to learn or don't quite get, etc. An example being the mathematical relationships between settings for shutter speed and aperture, metering and such. I imagine this would have been something learned in high school class relatively simply. Can anyone either explain this to me or direct me to a site or book that explains this simply and perhaps I could print to reference? It's not something I've ever seemed to grasp and would like to be able to know them off the top of my head like some of you do. Thank you in advance. Don't be afraid to post whatever you think I'm looking for, I'm sure there are others who want to learn this as well.