A craft is an activity such as weaving, carving, or pottery that involves making things skilfully by hand, often in a traditional way. When craft has this meaning, its plural form is crafts.
It's a pity to see the old crafts dying out.
A craft is also a vehicle such as a boat, hovercraft, or submarine that carries people or things on or under water. When craft has this meaning, its plural form is craft.
There were eight destroyers and fifty smaller craft.