The Basics of Green-Reading, AimPoint Express Style

Here's a link to a golf.com article that explains the basics of AimPoint Express, the simplified green-reading system being used by Adam Scott, Stacy Lewis, and other players.

Here's a general tip I found in the article that should help you make better putts even without using the AimPoint Express system (I added the emphasis in the second paragraph):

Here's a test of your green-reading savvy: Imagine a clock face on a typical back-to-front-sloping green, with the hole at the center, and the 12 o'clock position representing a straight downhill putt. Which putt will break the most: A sidehiller from the three o'clock position? A downhill, sidehill putt from two o'clock? Or an uphill sidehill putt from four o'clock? (Assume that each putt is hit with excellent speed, so that it would roll 1.5 feet beyond the hole if it missed.) If you said that the sidehill putt (three o'clock) would break the most, you're in the majority—but you're wrong. The downhill putt from two o'clock will break the most and the uphill putt from four o'clock the least.

Why? A putt breaks because it is falling due to gravity. Since the putt from two o'clock is slightly downhill, it's hit more softly than the three o'clock putt, so it takes more time to reach the hole. Since gravity has a longer time to act, the ball breaks more.

Even if you don't try the AimPoint Express technique, that tip alone should save you some strokes.