A shared credential is a general password or code that is required by a group or all employees as part of their employment with you. For example, this could be the access code for the office door.
Shared credentials should be added via the shared credential function on the dropdown menu. This can then be allocated to each employee when they are being set up.
A private credential is information that you wish to share with one individual employee. For example, this could be their login details for the IT system. This should be added at the employee level (Menu > Employees > View Employee Details) on the credentials tab.