In a PowerPoint document, what is the best way to script your presentation and or add points to remember when presenting a particular slide?

Use the Notes function which can be accessed via the View tab, under Presentation views, Notes page. 
Add notes which can be accessed at the bottom of each slide at the bottom of the page.  
Add comments on each slide which can be accessed in the Review tab, Add comments.   
Keep notes on a piece of paper near you when you present.

The best way to script your presentation and add points to remember when presenting a particular slide in a PowerPoint document would be to use the Notes function. This can be accessed via the View tab, under Presentation views, and selecting Notes page. This allows you to add detailed notes and reminders for each slide, which can be viewed separately from the main slide during your presentation.

Adding notes at the bottom of each slide is also an option, but it may clutter the slide and distract the audience if they are visible during your presentation.

Adding comments on each slide, which can be accessed in the Review tab and selecting Add comments, can be useful if you want to collaborate with others or gather feedback on specific slides. However, this function is not specifically designed for scripting or adding points to remember during a presentation.

Keeping notes on a piece of paper near you can be helpful as a backup, but it may be less convenient to reference during your presentation compared to using the dedicated Notes function within PowerPoint.

Overall, using the Notes function within PowerPoint provides the most seamless and efficient way to script and add points to remember when presenting each slide.