What are the first three visions and warnings in Macbeth?

1. The Three Witches: Macbeth and Banquo encounter three witches on the heath who make a series of prophecies, including that Macbeth will become Thane of Cawdor and eventually King of Scotland.

2. The Ghost of Banquo: After Macbeth becomes king, the ghost of Banquo appears to him during a feast, symbolizing Macbeth's guilt and paranoia over the murder of Banquo.

3. The Apparition: Macbeth seeks out the witches again and is shown a series of apparitions that warn him of impending doom, including a floating head, a bloody child, and a crowned child holding a tree.