After installing Oracle Clusterware, as described in Oracle Grid Infrastructure Installation Guide for your platform, you can install Oracle RAC Database software.

• About Image-Based Oracle Database Installation
  Starting with Oracle Database 18c, installation and configuration of Oracle Database software is simplified with image-based installation.
• Setup Wizard Installation Options for Creating Images
  Before you start the setup wizards for your Oracle Database or Oracle Grid Infrastructure installation, decide if you want to use any of the available image-creation options.
• Deciding Between Multitenant Container Databases and Non-CDBs in Oracle RAC
  Review the information to decide how to deploy your Oracle Database using the CDB or Non-CDB options.
• Installing Oracle RAC and Oracle RAC One Node Databases
  Understand the process to install Oracle Real Application Clusters (Oracle RAC) and Oracle RAC One Node Databases.
• Simplified Upgrade of TIMESTAMP WITH TIME ZONE Data
  Time zone files are upgraded when you install Oracle Real Application Clusters.
• Overview of Installation Directories for Oracle RAC
  Both an Oracle Base directory and an Oracle Home directory are used for every installation of Oracle Database software.
• Specify Oracle Home User Name and Password
  To provide enhanced security for your Oracle Database software, you can select to use an Oracle Home User.
• Updating Environment Variables on Remote Nodes
  Changes made to registry and environment variables are not immediately visible to user sessions on remote notes.
• Creating an Oracle RAC Database on Direct NFS
  There are different configuration processes you must perform when installing and create an Oracle RAC database that uses Direct NFS (dNFS) for the database files.