Loot can come from Chests "Chests (Battle Royale)"), Ammo Boxes, Faction Chests#Faction_Chests "Chests (Battle Royale)"), Supply Drops "Supply Drop (Battle Royale)"), and Supply Llamas.
Looting is a priority at the start of a game of Battle Royale. You will have to carry something that will deal damage to other players, and collect loot of better Rarity as you progress. Loot can come from Chests "Chests (Battle Royale)"), Ammo Boxes, Faction Chests#Faction_Chests "Chests (Battle Royale)"), Supply Drops "Supply Drop (Battle Royale)"), and Supply Llamas. A good loadout will consist of 3 weapons (2 of them should ideally be an Assault Rifle and a Shotgun or SMG), and 2 consumable items/1 consumable and 1 throwable (Ideally a consumable that gives you Shield.)