The V on the Handle: Forehand as the Home Grip
The forehand grip is formed as if shaking hands with the racket. The palm sits against the handle, the fingers wrap loosely around it, and the crease between thumb and index finger makes a V that lands on the thin top ridge of the handle. The index finger stays slightly apart from the middle finger, because that finger steers the racket face at the moment the strings meet the shuttle. The heel of the hand sits near the butt of the handle so the full length of the racket is used.
This grip covers more strokes than any other: overhead clears and smashes, drives on the right side and forehand net shots. Right-handed players therefore return to it after every shot, since the turn to any other grip is shortest from here. Left-handers use exactly the same pattern in mirror image, so their forehand side sits to the left of the body.
Checking it takes seconds. Stand in front of a mirror or film your hand with a phone and see whether the V stays on the centre line of the top ridge after a few swings. The fault seen most often is the hammer grip, where all fingers are bunched, the index finger is clamped and the string bed tilts down, sending the shuttle into the net. A useful first drill is bouncing the shuttle upwards again and again with the forehand grip until the hand finds the position without a glance.
The V on the top ridge of the handle is the quickest check of a forehand grip in the middle of practice.