If you want to become a screenwriter, it’s so important to learn how to write action lines in a script. Action lines take up the bulk of a reader’s attention. It’s where you spell out what’s happening ...

One does not simply write a script for a mind-bending, choose-your-own-adventure film on a piece of paper. For the interactive “Black Mirror” film “Bandersnatch” that dropped on Netflix on Friday, a ...