Explanation
These are some of the tasks that you would perform to secure the special user "SAP*" in AS ABAP. The user
"SAP*" is a default user that can be used to log on to any client with a predefined password if no other users exist or if all users are locked. To prevent unauthorized access using this user, you should remove all authorizations from it, lock and expire it in all clients, and set the profile parameter login/no_automatic_user_sapstar to 1, which disables the automatic logon feature for this user. References:
https://help.sap.com/doc/saphelp_nw70ehp3/7.03/en-US/c8/e8d53d35fb11d182b90000e829fbfe/content.htm?no_

Explanation
These are some of the reasons why you would choose an "anonymous SSL Client PSE" setup in SAP systems.
An anonymous SSL Client PSE is a PSE that does not contain any client certificates or keys, but only contains certificates of trusted certificate authorities (CAs). It can be used to establish SSL connections with servers that do not require client authentication, but only use data encryption to protect the communication. It can also be used as a container for storing the CAs that are trusted by the client. References:
https://help.sap.com/doc/saphelp_nw70ehp3/7.03/en-US/c8/e8d53d35fb11d182b90000e829fbfe/content.htm?no_
https://help.sap.com/doc/saphelp_nw70ehp3/7.03/en-US/c8/e8d53d35fb11d182b90000e829fbfe/content.htm?no_

Explanation
These are some of the users that should exist in client 000 of an SAP system. Client 000 is a special client that contains configuration data and tools for system administration and maintenance. TMSADM is a user that is used for Transport Management System (TMS) communication and administration. SAP* is a user that can be used to log on to any client with a predefined password if no other users exist or if all users are locked.
References:
https://help.sap.com/doc/saphelp_nw73ehp1/7.31.19/en-US/c8/e8d53d35fb11d182b90000e829fbfe/content.htm?

Explanation
Configuration Validation in SAP Solution Manager allows you to check the consistency of settings across your SAP environment by comparing them with a reference basis. The reference basis can be either a virtual set of manually maintained configuration items or a target system in your system landscape that serves as a template or best practice example. References:
https://help.sap.com/viewer/bf82e6b26456494cbdd197057c09979f/7.2.10/en-US/4a0c1f51bb571014e10000000a
https://help.sap.com/viewer/bf82e6b26456494cbdd197057c09979f/7.2.10/en-US/4a0c1f51bb571014e10000000a

Explanation
SAP Information Lifecycle Management (SAP ILM) provides functions to support Data Destruction, Business Rules Maintenance, and Processing of Audit Areas. SAP ILM enables you to manage the retention and destruction of data according to legal and business requirements, as well as to archive and delete data securely and compliantly. References:
https://help.sap.com/viewer/product/SAP_INFORMATION_LIFECYCLE_MANAGEMENT_ILM_/200/en-US
https://help.sap.com/viewer/product/SAP_INFORMATION_LIFECYCLE_MANAGEMENT_ILM_/200/en-US