Pair typefaces that have similar physical attributes

Letters set in Rooney and Skolar reveal that the two typefaces are a good match.

Aura Seltzer, writing for Typekit:

This strategy requires a careful balance. You’ll want to look for typefaces that are similar enough to create visual uniformity but not too similar that there is an uncanny resemblance. With too many similarities, readers won’t be able to tell your typefaces apart, and their eyes will focus on the slight differences between letterforms instead of on your writing.