How do you thorow an effective curveball, knuckleball, and slider?

Question

I am a lefty

Answer 1

Curveball is thrown by gripping seams and rolling thumb upward as you release.

Knuckle ball is thrown by placing thumb and ring finger on outside of ball and placing fingernails or knuckles on the ball and pushing the ball out to eliminate any rotation. As the ball floats on the air it creates turbulance which will make the ball jump, float or drop.

Slider is thrown with first two fingers on upper seam. as you release the ball act as if you are trying to push your fingers downward through the ball. this will cause it to break L-R (for a rightie) and also reduce the speed. The arm motion is the same but with the sideways motion and slower speed it should fool the batter.

Answer 2

Practice Practice And some more Practice Thanx

Answer 3

Don't let the batter hit it.