Write a note on the plot construction of 'Hamlet'

I am assuming you are asking about the written structure
of the play.  Shakespeare's tragedies followed the pyramid formula with the exposition
occurring in Act I followed by the rising action in Act II.  In Act III the climax
occurs which leads to the falling action in Act IV and the final resolution, or
denoument, in the final Act V.

Exposition sets up the
background of the story, introduces the characters and the chief conflicts.  The rising
action presents events that spring from the chief conflict but that often produce grave
consequences.  The chief 'point of no return' occurs in Act III when the character
creates for himself a situation which he cannot undo.  The falling action reveals the
swiftly compounding consequences resulting in a resolution in Act V.  In a tragedy, this
resolution is often death and the restoraton of order by some outside
party.