How Are Logic Node Outputs Defined?

Hi. Newbie here.
Logic nodes have 2 or 3 outputs. How do I know what each of the 2 or 3 nodes are, so I know what to join them to in the next step of the flow ?

For instance, “Scan QR/Barcode” has 3 nodes on the right. but I don’t see a definition or properties of what they mean.

EDIT. I found the “OUTPUTS” Tab which explains most of the ports/nodes. A few don’t have any explanation. Are they user defined ? “Scan QR/Barcode” shows “OUTPUTS AT PORT 2” as blank.