This instructable includes different types of pitches.
Step 1: 4 seamer
This is a regular 4 seam fastball.
Step 2: 2 seamer
This is a 2 seam fastball,
Step 3: Changeup
This is a changeup. Throw slowly and accurate.
Step 4: Circle Changeup
This is a circle changeup. Throw slowly also.
Step 5: Curveball
Start at this grip, Then twist around to make your palm point upward. If you are under 25 you could seriously injure your arm throwing this a bunch of times.
Step 6: Slider
This has a lot of movement. Throw regular. Not slow.
Step 7: Knuckleball
Throw overhand. Don't flap wrist when throwing.
Step 8: Enjoy
Have fun. I hope this will help you in the future if you become a pitcher. I am also a pitcher. Remember, do not throw the curveball a bunch of times.