How Do You Troubleshoot the yum Repository “Errors during downloading metadata for repository”?

Problem scenario
You try to use a yum command on RHEL 8.2. But you get this error:

Docker Repository 0.0 B/s | 0 B 00:00 Errors during downloading metadata for repository 'foobar': - Curl error (6): Couldn't resolve host name for [Could not resolve host:] Error: Failed to download metadata for repo 'foobar': Cannot download repomd.xml: Cannot download repodata/repomd.xml: All mirrors were tried

What should you do?

Run this command but replace "foobar": sudo yum-config-manager --disable foobar

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