There are following default statuses and their rules:

  Stock Movement User Group Change Reward Points Change (Needed) Reward Points Change (Received) Download
Pending - No Change - No Change No
Confirmed = Yes - + No
Canceled + Yes + - No
Shipped = Yes - + No
Refunded = Yes + - No
Completed = Yes - + Yes

Oder default statuses can be extended with new statuses. The rules by default statuses can be changed to fit need of current e-shop.