During installation, by default you can create multiple disk groups.

If you plan to add an Oracle Database for a standalone server, then you must create the fast recovery area for database files.

• About the Fast Recovery Area and the Fast Recovery Area Disk Group
  The fast recovery area is a unified storage location for all Oracle Database files related to recovery. Enabling rapid backups for recent data can reduce requests to system administrators to retrieve backup tapes for recovery operations.
• Creating the Fast Recovery Area Disk Group
  Use this procedure to create the fast recovery area disk group.