Question: what are the korok seeds for?
Answer: Korok Seeds are actually the beads used in Hestu's Maracas. When first found, Hestu asks Link to retrieve his Maracas from a group of Bokoblins nearby. ... In exchange for Korok Seeds, Hestu will add one slot to Link's Weapon, Bow, or Shield stashes. Link can fully upgrade his inventory with only 441 Korok Seeds.