Start here. A movie is a person plus something that happens to them. Name both. If you only have a place or a mood, you do not have a story yet.
Subject
Two questions only. What happens, and who it happens to. Write events and a person, not a theme.
Two incidents
Act I usually has two hits, not one. They are easy to write as the same moment. They are not.
Inciting incident knocks life off balance, often around pages 10–15. They can still say no and go home.
Key incident is the story you came to tell, often the end of Act I. After this, going home is gone.
The first opens a door. The second walks through it and shuts it. If both boxes are the same event, one of them is missing.
First ten pages
The opening should show who they are, what kind of story this is, the situation they are in, and the first push forward. Check a box only when the pages actually do that job.