Players can learn four different Common Skills: Expand Common Craft, which expands either the Dwarven Recipe Book (if you’re a dwarf) or the Normal Recipe Book (used to make Accessories with materials gained through fishing); Expand Trade, which increases the number of items that players can sell in private store mode; Expand Inventory, which increases the number of items that a player can carry; and Expand Storage, which increases the number of items that a player can store.