Macbeth is a play that is a warning against those who seek to undermine or overthrow the role of a rightful king
Macbeth is a tragic hero, with his hamartia being ambition
Macbeth, at first, is presented as a noble and loyal general in his attempt to cling onto power
Macbeth then commits regicide, then the murder of his best friend as well as women and children. He is condemned to death by Macduff
Shakespeare's intentions:
Shakespeare is presenting a morality play to his Jacobean audience: allow yourself to be morally corrupted and act against societal norms and you will suffer the consequences.