Any weapon or tool can be used to harvest branches from trees, though certain trees do not give branches at all. Branches are vital for most structures and crafting recipes. They can also be used to make fire, but using Flint erases the risk of failure. Branches are essentially the building blocks of everything you make, from your first hammer to the most complex shelters. They are also important in planting due to the fact that they can be grown into trees when used on the appropriate terrain, making them effective investments for when you begin to chop trees for logs and need to resupply them.