When designing a slide it is necessary to choose how many fonts or typefaces to use. The answer to the question of how many different typefaces to use in one SlideShow is typically one or two. There might be times when you need to use more, but there has to be a good reason for doing so.
Many typefaces comes with many different sizes and weights (bold, light, black etc. ). They can also be italics or condensed. This gives you a large amount of variations within one typeface. You can easily create hierarchy within your text by choosing different combinations of weights and sizes etc. and you do not need to use many different typefaces. By using fewer typefaces it is easier to create harmony within your slides and in your presentation.
Below is a “Before” that uses 3 different typefaces and the design is kind of messy. In the “After” only one typeface is used so we have nice harmony and by using different weights and sizes we can create a nice hierarchy to focus the viewer on the important parts of the message.