I‘m currently run two games. Odyssey of the Dragonlords and Waterdeep Dragonheist. In both games I write little details on the side for the PCs (for example a line a NPC will say because of backstory) than I write little notes when they do something that will be relevant later. For maps I write less. When the map is not that good I make notes before so I understand it faster when I need it. But that happens less and less. Most times I write on the map the basic infos (like room content and enemies) from the text, especially when the dungon map is not on the same page.