With resources on you, backtrack several steps towards the abandoned camp and see Lara prepare her first primitive, and the most effective at the same time, weapon - bow. In a near future, you will be able to upgrade not only this one, but also other weapons that you find in the game world. Also, you will be able to find better and more effective versions of those. There are four ways in which you can obtain individual weapons. You can find them, receive them from someone else, craft on your own using elements hidden in special chests, or buy from a trader. This also goes for items in your equipment.