An operator's settings define its behaviour when applied in an Operation.
Operator settings can contain a section to define relevant columns of the input table and a section for other operator-specific settings.
All operators provide the fields "Id" and "Notes", where arbitrary explanations for the operation can be entered. The text entered in "Id" later shows up in the list of operations of the data node.
An alphabetical list of operators and their descriptions can be found here Operators (alphabetical overview).