SAP security and authorization concepts

SAP security and authorization concepts :
Create, change and delete User, user groups and roles 
Building user menus of a role by adding transactions, reports, and Internet/intranet links, and so on to the menu. 
Comparison of Role Menus 
Composite roles and derived roles 
Profile Parameters for Logon and Passwords (Login Parameters) 
Troubleshooting missing authorization issues 
HR authorization and indirect role assignment