It is an obsolete form of the word 'do', namely third-person present tense. One well known example is 'The lady doth protest too much', from Shakespeare's play Hamlet. It has been replaced with "does" since Shakespeare's day.
The major plot element spoiled in the prologue of Romeo and Juliet is the tragic ending of the play, where the two young lovers, Romeo and Juliet, ultimately die.
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the plot is to start the story
No, there is not. Contrast King Lear.
Romeo and Juliet
Romeo and Juliet
He gives an overview of the plot in the Prologue, but it is extremely vague and general. Most of it you could guess from the title: "The Lamentable Tragedy of Romeo and Juliet."
Romeo and Juliet.
All the family members of the Montagues and Capulets are blamed and punished in Romeo and Juliet. This is because in one way or the other, they were all involved in the plot that lead to the consequences of Romeo and Juliet's fate.
he died for julliet
The plot of the play Romeo and Juliet was not actually an original to William Shakespeare. "The Tragicall Historye of Romeus and Juliet" by Arthur Brooke is supposedly where he got the story. However, Brooke borrowed the story too. In fact it is fair to say that every version of Romeo and Juliet that we know of borrowed most of its plot from an earlier source.
Pyramus and Thisbe