CentOS repositories are collections of software packages that are stored in repositories and can be installed on your system via yum or dnf package managers.
Use the command yum repolist or dnf repolist to list all currently enabled repositories in CentOS.
To enable a specific repository, run: sudo yum-config-manager --enable <repository-name> or sudo dnf config-manager --enable <repository-name>.
To disable a repository, use the command: sudo yum-config-manager --disable <repository-name> or sudo dnf config-manager --disable <repository-name>.
You can enable or disable a repository for a single session using the --enablerepo or --disablerepo flag in your yum or dnf commands.
Repository configurations are stored in /etc/yum.repos.d/. You can manually edit these .repo files to enable or disable repositories by changing the enabled=1 or enabled=0 values.
Once you enable or disable a repository, verify the changes by running yum repolist or dnf repolist again to ensure your modifications have taken effect.