What were the three big pieces of the treaty of versailles?

The Treaty of Versailles, which formed the core of the peace settlement after World War I, was signed on 28 June 1919. Outside the German delegation, it was signed by two countries of the initial Triple Entente that had gone to war against Germany in August 1914, France and the United Kingdom (the third one, Russia, having already signed a separate treaty at Brest-Litovsk on 3 March 1918), and by a number of nations that had joined them at later stages in the war, the major ones being Italy, Japan, and the United States (1917). This widely different experience of the war explains why unity of purpose was so difficult to achieve among the Allies during the peace conference that opened in Paris on 18 January 1919.