Some game resources are finite, so you may find yourself short of them. However, after you reach level 9, you will be able to enter the new district, where the broken Shed is located. By repairing the Shed, you will gain access to the raid option.
You can order one of the basic resources in the Shed, except for grass. Each raid requires energy and time, but you can speed up this process. There can be only one active raid at a time.
