Hello, thank you for seeing this question.
For example, you want to make a game the content of which is like this. ↓
At the upper left of the screen, pictures of monitoring cameras are displayed, and the player can controll a first person carácter using main camera. Using monitoring camera, the player has to kill enemies and defend something important.
To make a game like this, you have to use multiple cameras and display them in one screen.
How can I do this?