Display face will always be your HEADLINE or TITLE. It should have some kind of contrast to your body typefaces. The Display Face is usually only a few words.
Note how MacDonald's likes to to get casual and friendly with their "I'm lovin it" tagline
For Super Bowl 51 they created a Super display typeface , then secondary faces.
SECONDARY DISPLAY in use
Complimentary Main Body Font
Congratulations! for you to experiment with
Now that you have gotten
FREE DISPLAY FONTS