If navigating SAP is brand new to you, please review the Learn More About It section of Introduction to SAP webpage before proceeding. The SAP Navigation video tutorials explain what SAP is, how it is structured and how to navigate SAP using transaction codes or menu paths.
This list of HR Personnel Administration terminology provides definitions for many of the HR terms used in SAP.
SAP Security
Each employee's SAP security is customized based on what the employee needs to do their job. This may result in you not being able to see all infotypes. For example, many people cannot see banking information (IT0009) for other employees but they can view their own.