Welcome NPS,LE,
To get started yo can go to gunnersden.com, a simple and straightforward encyclopedia of shotgunning where you can learn terms and ideas to bring back to our forum for discussion. check out Sgotgun Shot & choke Guide under shotgun shooting, it is the last topic. Here is the address;
http://www.gunnersden.com/index.htm.shotguns.html
You can always use our libary and search features to get info and read previous discussions.
If you have questions that you don't want to go public with feel free to PM me. I am a Tactcool
kind of guy, you will find bigjim, zippy13 big time skeet and trap guys, hogdogs and rantinredneck are good old hunting dogs. I have left a bunch out, but in general
I think the best shotgun forum going is right here.
Good Luck & be safe