Rewarding means reacting positively after something has gone well. This could be words or a small symbol that shows what was successful. Rewarding is there to provide clarity, not as the main reason for doing something.
For example: after a successful potty moment, a parent briefly says what went well and puts a small mark on the overview together with the child.
How it helps: making what was successful visible provides support and language. Compliments remain the most important thing; symbols are temporary and simple.