During a rally, after bouncing on the ground, the ball can hit any other surface multiple times (except the ground). Therefore, the door handle, fences, walls… everything is part of the court and can lead to unexpected trajectories.
The second bounce on the ground results in a loss of the point for the receiver. Similarly, a ball that, after its first bounce on the ground, goes out of bounds also results in a loss of the point. A ball that, after bouncing off a wall, returns to the batter's court also scores a point. However, after crossing the net, any ball that first touches any surface other than the ground is a fault for the receiver.
Points are counted like in tennis (15, 30, 40, game, set, match).