Phaoris

Hi all I'm new to game dev and need some insight... My immediate interogation is how do you call the zone changing, I mean you are control a toon and you enter a castle, how do you call the changing transition and how do you manage it, I wanted to do something basic like old mario style , a black screen zooming in when you enter and zoom out and disappear when the new world/castle has loaded Do you have any idea about tutorials about my issue ? Thx a lot for your help guys