[Help Center]
Oracle Help Center: https://docs.oracle.com/en/
[Install Guides]
Oracle Database 19c – Install and Upgrade: https://docs.oracle.com/en/database/oracle/oracle-database/19/install-and-upgrade.html
[Install Requirements]
Oracle Database (RDBMS) on Unix AIX, HP-UX, Linux, Solaris and MS Windows Operating Systems Installation and Configuration Requirements Quick Reference (12.1/12.2/18c/19c) (Doc ID 1587357.1): https://support.oracle.com/epmos/faces/DocumentDisplay?id=1587357.1
[Licensing Information]
Oracle Licensing Information: https://docs.oracle.com/en/database/oracle/oracle-database/19/dblic/Licensing-Information.html#GUID-0F9EB85D-4610-4EDF-89C2-4916A0E7AC87
[Multitenant Architecture]
Oracle Multitenant Architecture: https://docs.oracle.com/en/database/oracle/oracle-database/19/cncpt/introduction-to-oracle-database.html#GUID-AB84D6C9-4BBE-4D36-992F-2BB85739329F
[Common and Local Users]
Overview of Common and Local Users in a CDB: https://docs.oracle.com/en/database/oracle/oracle-database/19/multi/overview-of-the-multitenant-architecture.html#GUID-3BB161DA-9CC0-4D61-A2C1-5D3662E0DECF
[NetServices Admin]
Net Services Administrator's Guide: https://docs.oracle.com/en/database/oracle/oracle-database/19/netag/index.html