What do you write down when planning a session, an adventure, or a campaign?

I am running Star Wars (FFG/Edge). So I write down the opening crawl, which is a combination of what they did recently with some setup for the current session. I have a few more notes on important people, planets, cities, and ships for the session, and a general idea of steps they will need to go through. And last I have a few extras - uses for Dark Side points, ideas for Despair roles, and general complications if things are not flowing (or if they end steamrolling certain things so I have more content ready).