Mangos, delicious in smoothies, luscious in salsa, can be a slimy, slippery challenge to cut. The best way to go about it is to start first with a ripe, but still firm fruit. If the mango is too ripe, it will be a mushy mess, and hard to cut into pieces, though easy enough to scoop out for pulp.
The mango has a flat-ish oblong pit in the center of it. Your objective is to cut along the sides of the pit, separating the flesh from the pit.