Limit punctuation and avoid putting words in all-capital letters.Use key phrases and include only essential information. Simplify and limit the number of words on each screen.It is fine to vary the content presentation (bulleted list, two-column text, text and image, etc.), but be consistent with other elements such as font, colors and background. Use the slide master feature to create a consistent and simple design template.Tips for Making Effective PowerPoint Presentations
The key to success is to make certain your slideshow is a visual aid and not a visual distraction.
However, slideshows can also spell disaster even for experienced presenters. Slideshows are quick to produce, easy to update and an effective way to inject visual interest into almost any presentation.