In act one Bernardo, Francisco and Horatio are guarding the castle and Hamlet and the Ghost are talking. Then the ghost says "come with me."
Act two is all about who Polonius talks too which is his son, daughter and king and Queen. He wants to know more about his son's life and why Hamlet is acting weird.
Act three is about determining why hamlet has been weird lately and the King and Polonuis want to and try to eavesdrop on them to see if they can get any information. Then the play within the play takes place and Hamlet ends up being escorted to England