WHEN I JOIND A PANEL WITH A SHOT AND THEN RENDERE
THEM I FIND THAT THERE IS NO DEFERANCE AS I RANDER
WITHOUT JOINING .AND ALSO PLS TEEL ME WHAT THE DEFERANCE BETWEN PANEL AND SHOT.
Well in general you would consider to have everything set as shot. A shot is a scene that you would find in a traditional movie (from the time you turn the camera on to the time you shut it down).
Panels would be ways for you to put more details on a specific shot that is too complicated to be illustrated within a single image. This is useful for complicated camera shots or scenes with a lot of actions or lot of character having a part in the scene (it allow you to isolate specific section of the shot).
So the reason to use one over the other is to be better organized in your production. If you are to export to Harmony/Digital Pro you would also have every panel of a shot being added to a single scene project where every shot will have their own project.