Accumulator #3

I was going through the archives and came across a ton of info.

I saw this below and do not understand what is meant by the angles and how they affect the shot. Why are we alternating grips for different shots?

If a greater #3 Angle is desired, the Club is positioned more under the Heel of the Hand. If less is desired, it is positioned more toward the Cup (but still under the Heel). If Zero #3 is desired, the Club is actually positioned in the Cup.

Yoda also says minimal #3 for maximum power in a snap release.
As #3 is zeroed out, you will produce the Rhythm of Angled Hinging regardless of the Hinge action you are trying to employ. Very useful for short game shots.
what does zero'd out mean? I never understood that.
Look at a player at address down the target line, there is usually an angle between the left arm and clubshaft. Although the left wrist is in the Level condition (4-B-1 & 2-J-1), the club is usually on an angle to the left hand (under the heel of the hand). If that angle does do exist (all in one line) it is zeroed out. You can also get the same condition by having the left wrist fully uncocked condition, no angle.
gotcha..thanks

So, less angle you have less flail giving you less power?