Your resource balance is the amount of resources available to you for producing Units, upgrading buildings and equipment or researching. This is where the resources produced by your farms add up and where the resources you gather or receive from your allies are collected.
Base Capacity
The Base Capacity is the maximum amount of resources your farms can produce. Once the Base Capacity for a resource is met, the only way to increase this amount is to gather, trade or buy that resource. The Base Capacity can be increased by upgrading the farms.
FAQ: My farms have a certain production rate/hour but the amount of resources hasn’t changed.
When you tap on your Headquarters, you will see [Resource] Base Capacity. This means that once your farms have produced that amount, they will no longer produce the resource and the only way to increase it is to gather it.