When you select an object by clicking on it, a set of handles appear on the corners with a half-circle arrow in the middle. I know that these can be used to modify the object but I don't know the rules of how they work. I've searched the documentation but haven't found anything that explains them. Could you please tell me where to look to find the documentation of how the handles work? I know that this is pretty fundamental, but please be patient.
Thanks,
Mark