Describes how Houdini represents geometry using details, primitives, points, vertices, and attributes.
In Houdini you can not only edit the parameters of a surface node, you can reselect the geometry the operation applies to.
Tools on the Polygon tab let you modify polygons in the scene view.
Tools on the Model tab let you edit objects in the scene view.
The appearance editor mode of the data tree pane lets you edit various controls for object viewport/rendered appearance in one place.
You can mark a chain of compilable SOPs as a compiled block which can execute much faster in parallel.