Banquo and Macbeth was stopped by the robbers and they was told their future. Macbeth will be king but not his sons. Banquo will not be king but his sons will be king. And Macbeth will be the Thane of Cawdor.
Duncan came to Macbeth house to honor him for winning the war and on his success. A lot of council came to the party to support and get drunk.
Macbeth killed Duncan while he was sleep in bed. His wife had to persuade him to kill him so he become Mayor and get what he deserved.
The Second Killing
Lady Macbeth made an diversion by sobbing how bad she felt about Duncan's death. When the council ask Macbeth did he had something to do with Duncan's murder.
Macbeth went to go see the robbers one more time and they told him three important things that he need to know. The said beware of Macduff and he shall not be defeated until the forest is around his home. Also, anyone who is born as a women will not hurt Macbeth.
Macbeth got three murders to kill Banquo and his son. But, when the robbers went to kill them, they killed Banquo and Fleance escapes.