The ultimate guide to typography suggests that readability, legibility, and usability are the three core principles of good font selection. The right typeface enhances the user's reading experience without distracting them from the content. It ensures text is functional across various mediums, from print to digital interfaces.

The medium chosen for display significantly impacts how we perceive font weights. For example, a font that looks robust in print might appear thin on a low-resolution screen. Always test your primary text styles on the final intended device.