The book is based on censorship and distinguishes: manifest content and latent content. A concrete example is better than 1000 pages. You dream that you spend a pleasant time with a pretty woman; here is the manifest content (apparent); for Freud, there is a latent content (hidden) so censored. What is it? we advise you to use free association and you would ask: What, you think that this scene? Beaunez in one of his comics ("my orgies"), puts into images the dream scene where the man, a little distracted said: "I have to think to get gas for the weekend." You report this to Freud, who answers. Here is the latent content of the dream, so the censored; the dream hides the fact that you want to get gas. Conversely, if you dream that you take gasoline, the latent content is to share a nice time with a beautiful woman. Personally, I prefer a hidden breasts to a hidden purpose.
By dint of seeing the censored everywhere, you come to doubt everything, and so, you are heading straight towards paranoia to become a film hero like Marjane Satrapi ("voice"). Tip: give up Marabout_ bout_de_ficelle_selle_de_cheval method and read Hervey de Saint Denys to learn to direct your dreams.