What modifications did Kepler make to Copernicus model

Actually, the answer on edge is:

Planetary orbits are elliptical.

Planets closer to the Sun move faster.

Planets move in elliptical orbits and this theory was formulated by Johannes Kepler. Kepler's laws of planetary motion defined a set of rules followed by the planets while revolve around the sun and determines their orbits.

This modified the earlier theory of circular orbits from Nicholas Copernicus.