Weight
Whether the typeface/s are thin, regular, medium, bold or black
Leading / line spacing
The amount of vertical spacing between two lines of text
Kerning / letter spacing
The horizontal spacing between letters in text
Letter case
Whether the typeface is uppercase, lowercase, sentence case
⭐️ Consider where the text is applied and how the letter case appears in each instance
Hierarchy
The organisation of typefaces to structure information
⭐️ The 4 checklist items above should help define a hierarchy, as these values should be different between each font style
Usage
The do's and don'ts of how type is used e.g. what restrictions must apply, when to use which type where
⭐️ Visual examples of do's and don'ts help convey them clearer
Pairings
Related to hierarchy, and how your fonts combine and interact with each other
Guidelines
Documentation outlining all of the above to cement the principles
