Key Concepts
External Structure of Nodes

You can grasp the overall role of a node and the direction of data input/output at a glance.
Node Box
Connector
Internal Structure of Nodes
Double-clicking a node on the canvas will take you to the node editor for detailed settings for the node.
Except for the mandatory
Start Node
andEnd Node
, most nodes are broadly divided into three parts: Input, Settings, and Output.

Input
Node Configuration
Output