For an idea of how broad your question is, substitute "driver" for "shooter", and "passenger car" for "handguns" :
"I am a new driver and an incessant reader, so I am looking to read as much as possible in order to learn. Can you all point me to websites, books, other forums, etc that may be helpful? I am mainly interested in passenger cars at this point."
Thats a whole lot of readin' .....