Mapping
Mapping is the process of connecting the input/output fields of one node to a field in another node. This gives the power to use the output of other nodes as an input to the current node. It also allows you to provide a static value as a default or an E# expression which evaluates the final value based on the given expression during runtime. For more about E#
Generally, it works by connecting from one node to another. Once it is connected by dragging the arrow, the mapping options will start listing with their respective input and output fields on the connected node while having the configuration process for the existing node.
You can easily map by checking the field boxes based on the requirement and this process of mapping can be continued until the last node is mapped.
Note: only the fields of the previous nodes are available for mapping.