Next Macbeth is finally crowned King of Forres. And isn't as happy as he thought he would be. Since him and his wife are consumed by guilt and dirty hands.
After, the council and Lord of Forres concludes that Fleance (friend of Banquo) killed Banquo. Which was actually Macbeth's doing since he hired assassians to ambush both Banquo and Fleance, but Fleance ended up getting away. In addition to, they concluded that King Duncan was killed by his son, Donalbain.
Macbeth visits the witches about his prophecy. While there they tell him that he is now invincible which really this is a lie...
Macduff and Malcolm (both now rivals of Macbeth) conspire to inavde Scotland and kill its new king. Then Macbeth massacres everybody at Macduffs' castle (including his family). Which leads to an advancement of war. In addition to, while Macbeth was off, Lady Macbeth commits suicide from all the guilt. Lastly, Macduff is able to slay' behead Macbeth, because "he wasn't born from a woman naturally". Leaving Malcolm to conquer Scotland as the next new king.