"I am thane of Cawdor, if good, why do I yield to that suggestion" After Macbeth became thane of Cawdor he gets thoughts on murdering Duncan for the position of king and the witches in his kitchen add to it, Later Lady Macbeth convinces Macbeth to kill king Duncan whilst he is sleeping. Macbeth's will urges not to kill Duncan and yet Lady Macbeth further convinces Macbeth and his lust for power takes over and kills Duncan. In the end after Macbeth gets the position for King and gets overwhelmed with power.
Nature imagery
"Dark night strangles the traveling lamp,"
After King Duncan is murdered by Macbeth, we learn from the old man and Ross that some strange and "unnatural" things have been going on. Even though it's the middle of the day, the "dark night strangles the traveling lamp," which literally means that darkness fills the sky and chokes out the sun,(an eclipse?)Probably. And in this case, nature itself becomes a symbol for the political struggle.
Supernatural
"As sure as I'm standing here, I saw him" Macbeth see's banquo and starts to go mad after the deed was confirmed. Macbeth starts hallucinating and goes mad after killing his friend and see's Banquo in Macbeths seat with a crown atop his head and from this point on he tries to ignore it but gets more paranoid and starts talking nonsense about death. He later gets told a apparition showing banquo in a row along with other "random" people supposedly the successors and each have a crown on top of each of them
Blood & Gore
"He's lying in a ditch, with twenty deep gashes in his head" Macbeth orders murderers to assassinate Banquo during a feast and Macbeth starts losing his mind to the witches. The way the murderer confirms that banquo is dead to Macbeth, is to give him gorey details which at the theatre was a theme the audience enjoyed. "My lord his throat is cut that I did for him"
Banquo was told a inexplicit prophecy by the witches which enrages Macbeth to make him have a drive to kill Banquo. Banquo 's prophecy is "lesser but much greater life" which means his generation is not as great as his successors.
Dramatic Irony
"This castle is in a pleasant place." A sentence usually found in multiple plays which indicates a negative future or bad omen is to come later to the future. In Macbeth it starts of with the witches foretell the prophecy of Macbeth becoming the king which the witches weren't being specific about making Macbeth king in what way, as if in a pacifistic way or a aggressive way.