Why does some geometry guide are empty?

Hello,I am just a noob. When I learning the Geometry docs of compas, I noticed that some parts of them are just have title without any details like:Polygons and Polyhedrons\Curves and Surfaces\Shapes and Solids\Transformations. It bother me a lot. I am really want to know what’s going on.

hi @hgj313 there several guides, the API reference covers Polygon. that’s what your looking for?

Thank you very much!
It’s really helpful!