Tutorial 2: An in depth look at the Transform Node (20:10 minutes)
As well as detailing all the features of the transform node this tutorial includes an introduction to the parameters window, creating custom parameters, using variables in expressions and creating a simple HDA (Houdini Digital Asset) which is a tool you can create, reuse and share.
The Expressions used in this tutorial are summarised in a handy cheat sheet, along with a list of global and local variables
Using Expressions in Parameters
A handy reference guide to Houdini Expressions with lists of commonly used Global and Local Variables
If you want to recreate the scene shown here I have provided the Dutch House models shown in the video, which you can download below. There is also a copy of the completed scene and HDA.