Sakuna: Of Rice and Ruin/Items

Currency
Can be used to buy things from the capital, ask favors from the gods, improve fertilizer, upgrade spirit boughs, etc.

Ingredients
Can be used for cooking, eaten as is or to improve fertilizer.

Materials
Can be used to build things, upgrade certain spirit boughs or improve fertilizer.

Spirit Boughs
Equipped to equipment. These aren't innate to equipment and can be equipped provided they have a free slot to accommodate them. Most can be upgraded with amber, specific materials or when conditions are met.

Key Items
Found by exploring, as part of events or the storyline.