An overview of the workspace (canvas):
To add a block to the canvas, drag it with the mouse from the blocks panel.
To configure a block, double-click it to open the settings window.
The Delete button deletes blocks and links.
The canvas can be scaled with the Shift + Mouse Wheel.
You can link the output of a block to one of the inputs of a subsequent block.
The connection with the arrow shows the transfer of control and, sometimes, data flow.
A block may have several inputs. For example, a Task block may have three inputs - left, top, bottom of the block.
Output(s) are located to the right. There are two types of outputs: Output (OK) if the task completes without errors, and Output (Error):