Short answers, pulled from the story.
Adolf Hitler, Neville Chamberlain, Édouard Daladier, and Benito Mussolini signed the Munich Agreement on the 30th of September 1938. The Czechoslovak government was excluded from the negotiations entirely.
The Munich Agreement mandated the cession of the Sudetenland, a mountainous border region home to three million ethnic Germans, to Nazi Germany. The Sudetenland contained the majority of Czechoslovakia's border fortifications, its heavy industry, and its entire army.
The German army was to complete the occupation of the Sudetenland by the 10th of October 1938. The agreement was signed at 1:30 a.m. on the 30th of September 1938.
The Sudetenland held strategic importance because it contained the majority of Czechoslovakia's border fortifications, its heavy industry, and its entire army. By surrendering this land, Czechoslovakia lost 70 percent of its iron and steel production, 70 percent of its electrical power, and 3.5 million citizens.
After the Munich Agreement, the Sudetenland was occupied by Germany starting on the 10th of October 1938, and the rest of Czechoslovakia was exposed to direct German attack. On the 15th of March 1939, Slovakia seceded from Czechoslovakia and became a separate Nazi-subordinate state, and the remainder of the country was transformed into a protectorate of the Reich.