Going through the documentation and found the following were deprecated which we have may used in our environments.
The following tns parameters have been deprecated, When you process a query that involves a connected database link, the server acts as a client to the target database of the database link. For example, suppose you have an Oracle Database 12c Release 1 (12.1) database that connects to an Oracle 9i database. By setting the SQLNET.ALLOWED_LOGON_VERSION_SERVER parameter to 11 and the SQLNET.ALLOWED_LOGON_VERSION_CLIENT parameter to 8, you restrict connections to the Oracle Database 12c database to only clients running Oracle Database Release 11 or later
SQLNET.ALLOWED_LOGON_VERSION_SERVER
SQLNET.ALLOWED_LOGON_VERSION_CLIENT
IGNORECASE in orapwd utility has been deprecated, from 11g onwards the case sensitive password is allowed and while creating the password file you need specify ignorecase=y if case sensitive is switched off, I had a great problem during standby of doing this. Its a relief now.
Deprecation of SEC_CASE_SENSITIVE_LOGON parameter which enables or disables case sensitivity for passwords, is deprecated because the standards-based verifiers (SHA-1) do not support case sensitive password matching.
Deprecation of DBMS_NETWORK_ACL_ADMIN
Deprecation of DELETE_CATALOG_ROLE
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