Kudos to you notonthis for posting this help video.
I'd like to add, if you don't mind, is the amount of break increases as the speed of the green increases. Since you're hitting putts with less force/power on championship/tourney greens they will break more than putts on fast/very fast.
Also, uphill putts (especially Oakmont) break less than downhill putts. Don't be afraid of giving it extra 2 feet of distance on uphill putts. As the saying goes "Never up, never in."
As far as reading breaks I always read the putt from behind the player first. Just as in real golf. I adjust my line from there and then go to reverse view. Very rarely have to adjust my aim after switching to reverse. Unless the putt has a crappy camera angle from behind.
On big breaking putts try to find the apex (middle) of the break in the putt. I've also noticed over the years the dots will seem to line up at a certain point when you're moving your aim. If you do see them lining up (not all of them) that is usually the line.
And most importantly, your first instinct is 99% of the time right. I've done it hundreds of times. Line up the putt and move the arrow slightly at the last minute and end up missing by the amount I moved my aim.
I forgot to add:
You can also right click and zoom in if your view is further away than you like.
Nonzoomed view:
Zoomed in one click. You can go in even more by right clicking > zoom in again
Darin