An amazing tool that saves hours, or even days, if the project is big enough.
InDesign GREP styles are part of paragraph styles and allow you to automatically apply character styles to specific characters within a paragraph style. For example, you can set all ® and TM marks to superscript automatically so there’s no hours spent scanning through text looking for them and no chance of missing one.
Set up your whole project in one file or on InDesign Book and you can apply this across the whole project at once.