Some fonts look good on paper and some look good on screens. Generally, san serif fonts are better for use on screens, eg Arial, Gill Sans
In terms of size, the normal minimum size for text on a slide is 22pt. Anything smaller than that it is likely to be hard to read. 32pt is the preferred size for most text, with 40pt for titles.
This means you can never use standard office documents as visual aids, i.e.Word documents or Excel Spreadsheets. The text is never large enough to read, so do not be tempted to try. If it is vital that people see a new form or other office document, as part of your presentation, hand the document out before the start of your presentation and ask people to look at their own copy. Make sure there is enough for everyone.
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[…] lots of different fonts throughout your presentation, two fonts should be sufficient. See the Fonts entry for more advice on your choice of […]