What is the proper method to remove old kernels from a Red Hat Enterprise Linux system?

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Red Hat Enterprise Linux 8

The YUM version 4 (based on the upstream DNF project) method for removing kernels and keeping only the latest version and running kernel:

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$ yum remove --oldinstallonly

From the yum man page:

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dnf [options] remove --oldinstallonly
    Removes old installonly packages, keeping only latest versions and  version  of  running
    kernel.