This is an interesting book because it was the first to establish that:

1) There’s a connection between some part of the Dream and some part of the dreamer’s life from the previous day.
2) In every dream there’s an attempted or successful gratification of some wish, conscious or unconscious.
3) Many dreams contain symbols that appear absurd to the dreamer, but which are in fact universal making them transparent to a trained observer.
4) Sexual desires play an enormous part in our unconscious.
5) There’s a direct connection between dreams and insanity, between the symbolic visions of our sleep and the symbolic actions of the mentally deranged.

Freud contrasts the dream that my memory evokes with the dream and other added matter revealed by analysis. The former he calls the dream’s manifest content, the latter it’s latent content.

The conscious wish is a dream inciter only if it succeeds in arousing a similar unconscious wish which reinforces it.