The document outlines 3 common presentation mistakes and how to avoid them. The first mistake is to not prepare by creating slides first and instead think about the main message and audience impact. The second is to not overshare data but instead focus the talk and visuals on the main takeaway. The third mistake is to not let the slides be the focus but instead make yourself the presenter the star. It concludes by reminding presenters to consider the goal, audience, and main takeaways of the presentation.