Explanation
This is one of the ways that the SAP SSO wizard (transaction SNCWIZARD) simplifies the SNC configuration process. SNC (Secure Network Communication) is a feature that enables secure and encrypted communication between SAP systems and components using certificates and keys. The SAP SSO wizard is a tool that guides you through the steps of configuring SNC for your SAP system, such as creating or importing certificates and keys, setting up trust relationships, and activating SNC protection level. It also sets the profile parameters for SAP SNC in the instance profile, which are required for enabling SNC on your system.
References:
https://help.sap.com/doc/saphelp_nw73ehp1/7.31.19/en-US/48/9e2e3f6f8e41e8a283aaf2ad2c64c4/content.htm?n

Explanation
These are some of the tasks that you would perform to resolve the issue of a
"SERVER_NOT_REGISTERED" error message when trying to connect to an external RFC destination with a registered external RFC server program. The REGINFO file is a file that contains rules for allowing or denying registration requests from external RFC server programs to the gateway of an SAP system. The access list in transaction SMMS is a list that contains rules for allowing or denying connection requests from external RFC clients to an SAP system. References:
https://help.sap.com/doc/saphelp_nw70ehp3/7.03/en-US/c8/e8d53d35fb11d182b90000e829fbfe/content.htm?no_

Explanation
This is one of the ways that you can protect a table containing sensitive data using the authorization object S_TABU_DIS. S_TABU_DIS is an authorization object that controls access to tables based on authorization groups, which are groups of tables that share the same access restrictions. The DICBERCLS field of this authorization object contains the name of the authorization group for a table or a range of tables. To protect a table containing sensitive data using this authorization object, you must assign it to an authorization group and enumerate all table names of the tables containing sensitive data in the DICBERCLS field. References:
https://help.sap.com/doc/saphelp_nw73ehp1/7.31.19/en-US/c8/e8d53d35fb11d182b90000e829fbfe/content.htm?

Explanation
Return code 12 means that the user does not have the required authorization for an authority check but does have the authorization object in the user buffer. This means that the user has some values for the authorization object but not the ones that are needed for the specific check. 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
This is the recommended setting for the "Cross-client object change" option using transaction SCC4 for your Unit Test Client in the development environment. This setting allows you to make changes to repository objects (such as programs, function modules, classes, etc.) and cross-client customizing objects (such as number ranges, message classes, etc.) in your Unit Test Client without affecting other clients in the same system. 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_