Lt. Col. Jeff Cooper literally wrote the book on modern handguns in combat. In fact, you're probably already acquainted with a number of concepts he introduced to the world of pistols, even though you might not know his name. Some of them are so common sense and simple that it's hard to believe anyone had to invent them.
This was the genius of Jeff Cooper.
*****
The author could've done a better job describing the Carry Conditions - it's kinda hard to engage the safety on a 1911 with the hammer down unless you've got a BFH - Big Fucking Hammer.
Other than that, it's a pretty good article.