Grips

Four Seam Fast Ball	Fingers are evenly spread along the top seam of the ball. Some pitchers will need to place all four fingers on the seams. You can use a two seam fastball, but a four seam generally will give you more downward movement.
Curve Ball	Some pitchers like to put a bend in their thumb on a seam to create more spin. The hand is underneath the ball to produce the four seam sideways rotation.
Knuckle Curve	Thrown as a fastball with the index finger tucked. This is an imbalance pitch whereas the ball will come out of the hand with the sideways spin. Must remember to push the tucked finger out hard and fast at release.
Four Seam Rise Ball	Held the same way as the curve, but the wrist isn't bent. Some pitchers like to use the thumb in a tuck position to create more of a spin. Some pitchers also use a two seam.
Knuckle Ball	Knuckles can be tucked on the seams, or you can use your fingertips, or a combination of.
Drop Ball	Middle finger is behind the seam to create a top spin of the ball. Some pitchers can use a regular four seam fastball hold to pitch their drop.
Spinner Rise Ball	Wrist isn't bent and the fingers are on the spinner just like the rise ball above.