Understand the basics of working with PowerPoint slides and PowerPoint slide templates, including changing views and slides.
By default, all slides in PowerPoint 2013 use a 16 by 9—or widescreen—aspect ratio. You might know that widescreen TVs also use the 16-by-9 aspect ratio. Widescreen slides will work best with widescreen monitors and projectors. However, if you need your presentation to fit a standard 4-by-3 screen, it's easy to change the slide size to fit.
By default, all slides in your presentation use a white background. It's easy to change the background style for some or all of your slides. Backgrounds can have a solid, gradient, pattern, or picture fill.
A theme is a predefined combination of colors, fonts, and effects that can quickly change the look and feel of your entire slide show. Different themes also use different slide layouts, which can change the arrangement of your existing placeholders. We'll talk more about themes later in our Applying Themes lesson.
Try applying a few different themes to your presentation. Some themes will work better than others, depending on your content.