Tehran Conference: Britain and the USA to invade France to open a second front and take the pressure off the USSR. USSR to fight Japan after Germany were defeated.
Tehran Conference: United Nations to be set up after the war.
Tehran Conference: Areas of Eastern Poland to be given to USSR after the war.
The Yalta Conference was in February 1945
Yalta Conference: USSR to fight Japan after Germany surrendered.
Yalta Conference: Germany to be divided into four zones: US, Britain, French and Soviet. Berlin (capital city) would be divided in the same way.
Yalta Conference: Eastern Europe to be Soviet 'sphere of influence'.
Yalta Conference: Countries freed from the Germans would have free elections.
How much reparations Germany would pay in reparations was not agreed at The Yalta Conference.
Polish/German borders and free elections in Poland were not agreed for at The Yalta Conference.
The Potsdam Conference was in July 1945
Potsdam Conference: USSR would take reparations from the Soviet zone of Germany.
Potsdam Conference: Nazi war criminals would face trial.
Potsdam Conference: Germany would eventually be reunited and would hold democratic elections.
One change between Yalta and Potsdam was in April, Roosevelt died and was replaced by Truman who was an extreme anti-communist.
Another change between Yalta and Potsdam was in July: The US secretly tested its first atomic bomb successfully.
Another change between Yalta and Potsdam was the USSR freed countries in Eastern Europe from Germany but then kept their army in those countries.
Another change between Yalta and Potsdam was Stalin set up a communist government in Poland, ignoring the agreement at Yalta.