When creating or editing your links, you can enter any available keyword or string in the Back half field. You can also use the Optimize option to generate suggestions.
These are the options to choose from, along with they do.
Shortest provides a back half that is as short as possible.
Random will insert randomly generated characters.
Suggested generates a back half based on data from the destination URL.
Suggested with dash generates a back half based on data from the destination URL using one or more dashes.
Suggested with camel case generates a back half based on data from the destination URL URL using upper and lower case characters.
To use the Optimize feature:
