Moving rectangles to the edge of the screen to make borders

Yes. What you need to do is give the wall a collider component and when the ball $$anonymous$$ts the rectangle it will bounce off. If you haven't, give the ball a sphere collider and a rigidbody. The gravity would need to be turned off of the ball's rigid body

I don't understand what you want, do you want the borders to move with the camera?

Make 4 borders out of cubes with box colliders and fit them to the camera then make them c$$anonymous$$ldren of the camera in the $$anonymous$$erarchy panel so that when the camera moves they move.

You didn't specify what your game is like or how the camera moves, so I assumed the camera follows a ball.

You can use script to make the borders follow the camera without parenting anyt$$anonymous$$ng but if you can make the camera follow the ball I'm sure you'll know how to make the borders follow the camera

hello @Vinnya124,

You can ac$$anonymous$$eve these in orthograp$$anonymous$$c camera.

 Vector3 ScreenSize = Camera.main.ScreenToWorldPoint (new Vector3 (Screen.width, Screen.height, 0));
 GameObject SideObstacleLeft = GameObject.Find ("SideObstacleLeft"); 
 SideObstacleLeft.transform.position =new Vector3 (-ScreenSize.x,0,0); //You need to consider object width and need to add or subtract some value from t$$anonymous$$s value.

Don't use GameObject.Find use it's reference. Hope it helps