when groups of them left at the same time in different spots
they killed them or sent them to ghettos and concentration camps
I presume that you mean the ghettos, concentration camps, and death camps. Ghettos were closed off portions of towns and cities, most famously the Warsaw Ghetto, where Jews were forced to live. The ghettos were gradually liquidated, and the Jews sent to concentration and death camps as quickly as the Germans could manage.
Ghettos, concentration camps and extermination camps.
They were sent to ghettos prior to the Concentration Camps...
Ghettos preceded concentration camps. Concentration camps appeared during the Nazi era in Germany. Ghettos were present in the largest cities in Germany (and other large urban areas in other countries) well before that.
ghettos were places where Jews lived away from the Nazis they couldn't escape because they were a place where Jews were allowed in and could only sometimes go out .the Jews were usually taken away to the concentration camps after a while.
Poland
Life in the ghettos was not only restricted and confined, but eventually, everyone in the ghettos was carted to concentration camps.
ghettos, concentration camps, and death camps
They were taken from the ghettos to extermination camps, where they were killed.
The Jews were liquidated and forced to concentration camps.
In practice, that is exactly what the ghettos set up by the Nazis were.