My Fortress is on fire! How do I extinguish this?

I want to change Resource Buildings' location!

When I tap on a cave on the right side of my Territory, I get a message saying "A hidden den. It seems quite large." What is this?

How do I use Treasure Skills?

What do I get when I collect the treasures in the Cave of Treasures?

I accidentally upgraded a building. How do I cancel it?

I bought resources from Market but they're not in my inventory.

I have the resources but I can't upgrade my Gate!

What happens if my Gate Durability hits zero?

Prison Camp Level & Prison Capacity