The BlenderGuru, Andrew Price has posted a deep look into all of the input nodes that Cycles has to offer. The article is meant as a definitive guide to understanding all of the input nodes in the Cycles rendering engine.
The Input nodes in Cycles are almost as complicated and plentiful as its shaders.
Andrew notes that user manuals can get too technical, and can offer plenty of information, with little context, as most manuals will. This is why BlenderGuru has create the Input Encyclopedia – to explain all of the input nodes in simple an practical terms, with its nodes and properties.
If you’ve ever wondered what all of those options and nodes are in Cycles, and what they can be used for this article is for you. Check out the Cycles Input Encyclopedia at BlenderGuru.