Additional Info on a Person record contains all the data related to a Person, other than their contact information.
The Additional Info could contain data such as Education, College Registration, Employment, or other data depending on your configuration.
Each data set will be split into its own section. When a Person creates a Membership order, they will be presented with the sections applicable to their membership (this is configured based on your business logic). Depending on your configuration, Members may have the ability to add more than one entry per section.
For example, Education:
When a section is successfully completed, a green checkmark will appear beside the section header.