What methods did the Nazis use in their genocide?

The Nazis felts that Jewish people were inferior to them, so they rounded them up, first in ghettos and then in concentration camps. They made the Jews do hard labor and fed them meager, rotten meals. They also used gas chambers to kill thousands of people and afterward would burn the dead bodies.

Genocide of who? only this i can think of genocide wise was the holocaust. and it wasn't a complete genocide. but the used concentration camps and mass murder to try and rid the world of the jews ...