Adding on for dying light, there is a contaminated zone (I don't remember the exact name anymore) in a mall that has an ambulance right outside. You can get 4-5 of the same packages that you get from the airdrop without needing to fight a single zombie, and when you leave and re-enter they respawn.
Additionally, you can do the zones on easy and switch to the hardest available difficulty to trade them in since the higher difficulties give more xp for the trades.
Lastly, there are some spots near safe zones that volatiles climb up from only a single spot on the roof. You can easily grind combat xp by standing at that spot and knocking them back down.
Adding on for dying light, there is a contaminated zone (I don't remember the exact name anymore) in a mall that has an ambulance right outside. You can get 4-5 of the same packages that you get from the airdrop without needing to fight a single zombie, and when you leave and re-enter they respawn.
Additionally, you can do the zones on easy and switch to the hardest available difficulty to trade them in since the higher difficulties give more xp for the trades.
Lastly, there are some spots near safe zones that volatiles climb up from only a single spot on the roof. You can easily grind combat xp by standing at that spot and knocking them back down.