GNU/Linux RHEL 10 Installing EPEL Repository
How to Install EPEL Repo on Red Hat Enterprise based GNU/Linux 10 64-bit – Step by step Tutorial.
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, Red Hat Enterprise based Linux (RHEL), Red Hat and Scientific Linux (SL), Red Hat Enterprise based Linux (OEL).

1. Terminal QuickStart
How to QuickStart with Command Line on RHEL
2. Installing EPEL Repo on RHEL 10
To Install the EPEL Repository for Red Hat Enterprise based Linux 10, first enable the CodeReady Builder repository:
sudo subscription-manager repos --enable codeready-builder-for-rhel-10-$(arch)-rpms
Then install the EPEL release package:
sudo dnf install -y https://dl.fedoraproject.org/pub/epel/epel-release-latest-10.noarch.rpm
3. Enabling CRB Repo (Alternative Method)
If the above fails or you need an alternate method, try enabling CRB with:
sudo dnf config-manager --set-enabled crb