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These days, it's always a good idea to stick with approved repositories. An approved repository is one that is sanctioned by the distribution's official site. If you start adding unapproved repositories, you lose the guarantee of stability. And you will be heading into broken dependencies territory.

To see what repositories you are currently pulling software from, use the repolist option.

# dnf repolist repo id repo name appstream CentOS Linux 8 - AppStream baseos CentOS Linux 8 - BaseOS extras CentOS Linux 8 - Extras #

If you don't find a repository you need software from, then you will need to do a little configuration file editing. There are two places where the dnf repository definitions can be located.

 In the /etc/dnf/dnf.conf configuration file

 As separate files in the /etc/yum.repos.d directory

Good repository sites such as rpmfusion.org will lay out all the steps necessary to use them. Sometimes these repository sites will offer an RPM file that you can download and install. The installation of the RPM file will do all the repository setup work for you!