For performing any action in the game, a worker is needed. At the start only 4 workers can work simultaneously with a max capacity of 15 that can be unlocked with placing house NFT on map that increases the slots.
Worker (Farmer) - Worker will hunt fishes, gather food from animals, chop trees to harvest wood, upgrade buildings, gather gold and iron ore.
Each action must be performed by the respective workers. Workers can only work on one action at a time.