Change camera when change room 2D game

another beginner question I want to make a 2D game that when I enter a room the camera change, fix camera not following the player. How can I make that? Do I have to make several camera? or just 1 and change the position every time? how can i trigger it so the camera change or move?

The player moves through a trigger, and that trigger causes some script to execute which changes the position and rotation of the camera.