How to Write a Scene in a Film or Book

At first i did you know, because i was working fror a piece of source material and already had a text. Ors it wot sueste that mercyr broke it down like you would as an actor, breaking down a script in which you're trying to get into the mind stead of the characters. And what i mean by that is, so say, for example, you have a scene in a book or in a film about people, like a ordering a sandwich at a delly counter. That's what's happening. But who cares? What is it really about? What what needs to happen in that scene, emotionally? Otherwise it will fail. Well, you can decide