Bird Houses
You can craft bird houses and place them on any tree in the world, they will have a small chance to grant you things like feathers, eggs or even meat.
Feathers will be used to craft different arrows, eggs and meat is consumable items that can be cooked.
Furnaces
Furnaces will enable you to smelt unwanted items, scraps of metal, to craft better precision arrows, and metal arrowheads to increase arrow damage. (and more)