Use a font containing characters whose letters are clear, easy to discern and without serif such as Arial, Veranda, Helvetica, Tahoma. It is better to choose a font that looks like the handwriting (for e.g., comic sans MS)
Use large fonts (14 points minimum)
Allow the ability to resize text
Make sure that the page remains readable and functional when the text is enlarged
Avoid italics, capital letters and fancy fonts because they deform letters
To highlight a text, use colours, font weights and larger fonts
Highlighting should be used sparingly. Used to excess, it risks losing its effect
Avoid underlining words because it has too many connotations: it suggests that the underlined text is a link
Limit the number of fonts used. Use a maximum of two fonts in a text, one for titles and another for the text
If you use special fonts, you must be consistent in their use (e.g. If you use a special font for the subtitles, you must only use it for all the subtitles of the document)