Nice post BooG, this should help a lot and has covered a ton of the basic fundementals that Sklansky was referring to.

Just one slight edit you should make:

"Perhaps we've been three-betting often against a certain villain's open. Now we three-bet with AA. Here, our past three-bets manipulated villain's CURRENT continuing range into being wider/weaker (assuming he is observing)."

I assume this is obv what you meant to write, but just so no beginners get confused: When we 3-bet often/lightly vs a guy he will eventually (if he's paying attention) adjust by defending to our 3 bets with a wider range, either flatting more of the top protion of his range, or by sticking in money with air on a 4-bet bluff. Either way, our past 3-bets have made this spot with AA extremely profitable since he now continues with a weaker/wider range than before and hence puts money in as a big dog a lot more often.