Oracle recommends that you complete these tasks after installation.

• Creating a Backup of the root.sh Script
  Oracle recommends that you back up the root.sh script after you complete an installation.
• Setting Language and Locale Preferences for Client Connections
  Configure client applications connecting to an Oracle Database according to your locale preferences and your I/O device character set.
• Recompiling All Invalid Objects
  To identify and recompile invalid objects on the CDB and PDBs, use the catcon utility to run utlrp.sql after you install, patch, or upgrade a database.
• About Installing Oracle Autonomous Health Framework
  Install the latest version of Oracle Autonomous Health Framework to perform proactive heath checks and collect diagnostics data for the Oracle software stack.