What does "dnf config-manager --set-enabled crb" perform?

What does dnf config-manager --set-enabled crb perform?

man dnf config-manager:

--set-enabled, --enable
 Enable the specified repos (implies --save)

It enables the crb repository.

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For the future. if you want to rtfm in a bit nicer way (maybe not yet used to navigate man pages?), try DNF config-manager Plugin — dnf-plugins-core 4.2.1-1 documentation

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What is the crb repository?

some third-party repository that you installed and enabled. Nothing that Fedora provides.

Have a look at the content:

sudo cat /etc/yum.repos.d/crb.repo

likely this::

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