GNU/Linux Oracle 9 Adding EPEL Repository
Hi! The Guide Simply Shows How to Install EPEL Repo in Oracle Enterprise GNU/Linux 64-bit.
And the Extra Packages for Enterprise Linux (or EPEL) is a Fedora Special Interest Group that creates, maintains, and manages a high quality set of additional packages for Enterprise Linux, including, but not limited to, Oracle Enterprise Linux (RHEL), Oracle and Scientific Linux (SL), Oracle Enterprise Linux (OEL).

1. Terminal QuickStart
How to QuickStart with Command Line on Oracle Linux
2. Adding EPEL Repo on Oracle Linux 9
To Install the official EPEL Repository for Oracle Linux 9, use:
sudo dnf install -y oracle-epel-release-el9
Then enable the EPEL developer channel:
sudo dnf config-manager --enable ol9_developer_EPEL
3. Enabling CRB Repo (CodeReady Builder)
To Enable the CRB (CodeReady Builder) repository on Oracle Linux:
sudo dnf config-manager --set-enabled ol9_codeready_builder