30 points is the minimum size. Limit text to six lines, or a maximum of 25 words per visual. Using more than three font styles can be distracting. One font can be used for the title, another for the majority of points, and one for the most important point. To write on paper, use a thick marker.
Pens are available in the studio.
When presenting visuals keep the class reading with you and not ahead of you. For PowerPoint presentations, with more than one point on a single slide, use the build feature to add one point at a time. Limit the number of items on PowerPoint slides or printed pages to only material that is directly discussed during the time it is on screen. Computer displays such as PowerPoint presentations, need to consider TV Safe Area. Computer graphics with vibrant red colors or large areas of bright white or with a lot of small detail are a problem for TV use.