Ranes
Adventurer
Like others here, I used to create monster/NPC index cards, one card per creature type (with multiple, random hit point totals if required), but I would also re-write a module's encounters in shorthand, because it helped me remember them without needing to refer to my pristine module and thereby exposing it to game table hazards. However, when I'm reading an adventure, I prefer monster stat blocks kept to appendices. That's partly because my preferred system's stat heavy. If I'm reading an old 1e module, I don't mind seeing stats inline.
Having said that, these days I DM with a laptop bristling with PDFs, which renders a module's stat format almost irrelevant.
Having said that, these days I DM with a laptop bristling with PDFs, which renders a module's stat format almost irrelevant.