This is how you cut a pineapple.
Twist off the crown from the pineapple.
Position knife on bottom of pineapple.
Cut off bottom of pineapple.
Cut off top of pineapple.
Cut off side of pineapple.
Continue cutting off remaining sides of pineapple.
Remove pits and hard areas from pineapple.
Cut your pineapple into thick slices.
Cut the center core out of your slices.
Now you should have a set of slices with the core removed. You could stop here if you want to grill the pineapple.
I prefer to cut my pineapple into chunks.
Place in a bowl and let the sliced pineapple chill in the fridge.