Instead of thinking of notes, think of knowledge. The real question is: when should you capture knowledge in meetings?
The answer: whenever knowledge is of value and requires memory or analysis.

Focus on what the speaker is saying. Their role is to highlight the most critical information, explain nuances, and provide recent updates or additional vital points that may not be on the slides.

Always get an overview of the material before taking notes. The more complex or lengthy the article, document, email chain, or book, the more critical it is to identify the key facts and information.