GNU/Linux RedHat 8 Installing RPM Fusion Repository
You are Welcome! The Tutorial Shows You Step-by-Step How to Add RPM Fusion Repository on RedHat Enterprise GNU/Linux 8.x Desktop/Server.
And to Enable RPM Fusion for RHEL 8 there are 2 procedures, but here I describe How to Enable it on the RedHat Command Line.
Finally, the RPM Fusion Repository for RedHat 8 includes both: Free Open-Source Software and Non-Free Proprietary Software.

1. Terminal QuickStart
How-to Quick-Start with Command Line on RedHat Linux
2. Enabling EPEL Repo
First, Setup EPEL Repository
With:sudo dnf install --nogpgcheck https://dl.fedoraproject.org/pub/epel/epel-release-latest-8.noarch.rpm
Authenticate with the User Admin Pass.
If Got “User is Not in Sudoers file” then see: How to Enable sudo.3. Enabling RPM Fusion Repo
Then Install RPM Fusion Free and Non-Free Repositories
All-in-one Command:sudo dnf install --nogpgcheck https://download1.rpmfusion.org/free/el/rpmfusion-free-release-8.noarch.rpm https://download1.rpmfusion.org/nonfree/el/rpmfusion-nonfree-release-8.noarch.rpm
4. Enabling PowerTools
And Finally, Enable PowerTools
Playing:sudo dnf config-manager --enable PowerTools
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