The setup I got there isn't particularly advanced nor important to know settings. As long as it looks good for the design you're making, you're good to go.
In its essence I'm using an advanced perlin together with a layout mask to define where the landscape is generated. Then I use an erosion to get some nice sediment sliding down the mountain, and soften the terrain. The Thermal weather node have a slope selection on it, so it only affects the steepest parts, which you can see in the terrain closest to the camera especially.
The most interesting part, at least I think, is the textures and texture masks in the bright blue area. GeoShape, HeightFrag and RealColor are all part of GeoGlyph, and I have connected them to different parts of the Erosion. The same goes for some of the combiners and their masks. One part is the height map, another part may be the flow map. Combined, they make up for an interesting mask which can be used with the Color converter.
GeoGlyph really helps to speed up the process.