How should I go about explaining the apparition scene / significance of the apparition scene in Macbeth?What details should I include, and what...

The easiest structure one should follow when explaining
the apparition scene and its significance in the play "Macbeth" should begin with where
Macbeth began his downward spiral.

It is Macbeth's first
meeting with the three witches that he learns of his climb to the throne. After telling
Lady Macbeth of the prophecy, Macbeth realizes that he will not leave to fate the
time-line in his obtaining of the crown. Instead, Macbeth decides to take matters into
his own hands and take the crown now.

Once Macbeth murders
for the crown, he begins to change. Things are not the same for Macbeth. Macbeth begins
to hallucinate and is unable to sleep- given he has "murdered" his ability to sleep when
he murders Duncan.

Unable to face the changes in his life,
Macbeth goes back to see the witches. It is here where he sees the apparitions. The
apparitions give Macbeth a false sense of security regarding the crown and
Macbeth.

A full description of the apparitions and their
impact on Macbeth can be found at the link below.

The end
of the explanation should address the fact that Macbeth's false sense of security
foreshadowed his ultimate demise.