Each font or style (italics or bold) should be used consistently throughout your presentation. While a different font face or color is a simple way of highlighting certain terms you want for focus, too much of it will do exactly the opposite and distract the audience.
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Use one font and its variations in a presentation
- Steer clear of excessively bright colors or any flourished type face (both are hard to read)
- Keep the styles (eg. bold or color) consistent between slides, so it's easy to identify the hierarchy
