How can I do a detailed landscape? I am a beginner in the use of blender and in this community, so I do not know if this is the appropriate place to make these comments. I'm trying to make blender the landscape that is shown on the next page Landscape construction, since I think blender can do it in a faster way, but I still do not know how to do it, if someone knows how to do it would be a great help, on the page mentioned above, show each step of the construction of the landscape in detail. Any help is welcome. Thanks in advance

Following the advice of @cegaton this image is the result that I want to achieve,following the steps indicated in the web page of the hyperlink shared by me.
As of 2.78a, you can use adaptive subdivision by turning on experimental features, using a subsurf modifier, and checking the "adaptive" checkbox in the subsurf options. Then, you can head up to the object's node tree and connect a procedural texture to the "displacement" input of the material output. Depending on what kind of landscape you want to do, you can mix procedural textures using the mixrgb node. Noise alone yields a connemara-ish landscape, Voronoi + waves creates a desert and Voronoi + Noise creates alpine mountains.