Can I look it up? Then it's a fact. Otherwise it's a guess or a story.

Notes tend to mix three different things. Facts are things anyone could confirm, such as a figure on a dashboard. Assumptions are things you are treating as true but have not looked at. Interpretations are the story you tell about why a figure moved. Check the assumptions that carry the most weight before you build anything on them.

Read it once, then a question tests whether the trick stuck.