Reference
The lists to look things up in: document types, pipeline elements, functions, jobs and response codes.
Reference pages answer "what are the options?" rather than "how do I?". They are lists rather than explanations, so they are built for looking things up in and for scanning quickly.
You will find every pipeline element and its properties, every expression function, every document type, every scheduled job, every datafeed response code and every configuration setting, along with the query language, the XSLT functions and a glossary.
If you want to understand how something works rather than what its options are, the Concepts section explains the model, and Guides walk through the jobs you might want to do.