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His brother, Claudius, came out into the garden while King Hamlet was sleeping and poured poison into his ear.
Hamlet's father is dead. His uncle (Claudius) marries his mother. Hamlet sees his father's ghost and the ghost tells him that Claudius murdered him. Hamlet seeks revenge and kills Claudius. Hamlet also dies. There are many others plots in Hamlet but that is the main one
When the ghost reenters, he loses his skeptical attitude
Hamlet's uncle Claudius killed Hamlet's father (called Hamlet Sr.). The ghost of Hamlet Sr. comes back from the dead and tells Hamlet Jr. so. Hamlet Jr. confirms this by re-enacting the murder as a play, which upsets Uncle Claudius.
He reveals that Claudius murdered him. He doesn't tell Hamlet anything about Gertrude he didn't already know.
The ghost confirms hat Claudius murdered his father.
When Claudius flees from the 'Mousetrap' play, as Hamlet hoped he would.
No, the ghost instructs Hamlet to seek revenge on his uncle, King Claudius, for murdering him and usurping the throne. The ghost does not mention punishing Gertrude, Hamlet's mother.
Hamlet doubts the ghost's statement that Claudius had murdered him--the ghost could be lying. He re-enacts the murder in a play and has it performed in front of Claudius. Sure enough, it causes an attack of conscience in Claudius.
The Inciting Incident is when the Ghost makes Hamlet swear to get revenge on Claudius for murdering him.
Hamlet is disposed to believe ill of Claudius. He dislikes him and resents his marriage to his mother. That is why when the Ghost names Claudius as his murderer, Hamlet says "O my prophetic soul!"--he had already suspected as much. Because we hear Claudius admit his guilt (just before the "To Be or Not to Be" speech and in Claudius's "O my offence is rank" soliloquy) we know that the ghost is telling the truth. Otherwise, it might be plausible to believe that Claudius is innocent, as everyone including Gertrude seems to believe.
The ghost tells Hamlet the secret of his father's death. Hamlet's father was not killed by a serpent, but was murdered with poison. He also told hamlet that it was his uncle who murdered his father, and that he also seduced Gertrude, his mother. The ghost then tells Hamlet to avenge his father's death but to leave his mother alone.