First of all before i even answer, NEVER click on links that says "Click here to see the answer" BECAUSE IT IS A VIRUS OR MALWARE!
Answer:
3 Major post-war conferences were the Yalta, Tehran, and Potsdam Conferences.
Oversimplification of the Conferences:
Here is just the oversimplification of the Conferences since doing any sort of an essay is time consuming and takes effort. Lets start with:
1) The Yalta Conference
The Yalta conference did a few things that set the stages of the Cold war. It first created 4 occupations zones of Austria and Germany. The Soviets would receive East Germany and the Allies would receive Frankfurt, Kiel, Munich, and Hamburg (Pretty much just split east and west). Yalta answered some questions about Germany however the next conference would answer the rest.
2) The Potsdam Conference \ Agreement.
The Potsdam Conference went over the small details that weren't mentioned in the Yalta Conference. First of all, it discussed the military and regional government issues of Germany as well as promoting ideologies. All production of Military equipment would be banned. All soldiers of the military would be sent home, Generals and officials would be tried for in Democratic German courts. Finally, The issue of Borders would be solved in this conference. More specifically, the occupied German and Soviet occupied Polish borders.
3) The Tehran Conference
The Tehran Conference was not an agreement sort of thing held at the end of the World War, but it was held during the war in Soviet influenced Tehran to discuss strategies and War plans to deal with the German invasion in the the Soviet Union. The conference also dealt with deciding some post-war borders as well as discussing an offensive. They also dealt with the Polish Question but that's a whole other topic and it this post would be too large if i talked about it.
If you want to learn more information on these topics, go to Britannica.com.