This is just one theme introduced in Act 1.3. Numerous other themes are revealed: evil, ambition, the unnatural, the grotesque, and others. Ironically, when Banquo warns Macbeth that the witches may be tricking him in order to later bring him harm, he pretty much summarizes the plot of the rest of the play.
It shows the importance of family and community in rural areas
It is universal because i asked the same thing
