Web sites are good places to learn. Read and follow threads you find interesting.
This is a good site for general information and specific information. Keep reading Guns and Ammo and read the ads as well. Would second recommendation to google terms you want to understand. Don't worry about your level of knowledge as much as the four rules:
"Four Rules introduced by Colonel Jeff Cooper, which are:
All guns are always loaded.
Never let the muzzle cover anything you are not willing to destroy.
Keep your finger off the trigger until your sights are on the target.
Be sure of your target and what is beyond it."
Now I would suggest you learn about Col. Cooper.