We will clearly not face the Ruy lopez every time, after e4 e5. We could fight the kings gambit, some quiet openings, italian, scotch, Dutch gambit, and much more.
So we need to build up our retribire for other openings (not ruy lopez) and how to play them as black.
Please post what you know on the openings you play as black here (after e4 e5 and not ruy), and if you have any questions about any of the openings. We will try to answer as best we can.