The only part of Copernicus's theory that Kepler retained was the idea that the Sun is at the centre of the Solar System.
Kepler showed that planetary orbits were actually ellipses, not circles as proposed by Copernicus.
Johannes Kepler
the ideas would prove all knowledge to be wrong
Nothing. Copernicus died years before Kepler was born.
Johannes Kepler wrote several books in his lifetime. Some of his books are Epitome of Copernican Astronomy and Harmonies of the World, Selections from Kepler's Astronomia Nova, and The Six-Cornered Snowflake.
Pio
It was Galileo.
Kepler showed that planetary orbits were actually ellipses, not circles as proposed by Copernicus.
Johannes Kepler
Kepler made discoveries regarding the planet's distance from the sun and how long it takes a planet to orbit the sun. In Newton's Version of Kepler's Third Law, Newton expands on these ideas by using his Theory of Gravity.
idk
the ideas would prove all knowledge to be wrong
You can look for existing studies that support your ideas or conduct an experiment to prove your hypothesis.
Johannes Kepler
There are lots of planets in the Kepler series. To answer your question, we need to know to which number Kepler you are asking about.
Johannes Kepler determined that all planets have elliptical orbits.
There is no planet that is simply called "Kepler". The Kepler spacecraft discovered various planets, with names such as "Kepler-4b", "Kepler 11-d", etc.