Shaders is very broad topic.  Can you be more specific in what you are interested in.

DAZ Studio comes with a number of shaders, the default, humanSurface, UberSurface, AoA SSS shader. Many products/freebies for DAZ Studio use some of these shaders. There are also many custom shaders available. Finally there is the shader builder that lets you create your own shader.

Are you interested in trying to understand how to adjust material using the common shaders? Do you want to learn how to create your own shaders in shader builder?

There are some commented samples of scripts at:

http://docs.daz3d.com/doku.php/public/software/dazstudio/4/referenceguide/scripting/api_reference/samples/start

There is also a thread in the DAZ Forum on scripting with the title "DAZ Studio 4.x Scripting Documentation".  If you search for that title in the DAZ Forums you should find it.