Redhat uses "rpm" (Redhat package management). Redhat 8 is very old. I would suggest downloading a modern distro like fedora (based on redhat) and try it on a spare computer. It will teach you alot. If you must use Redhat 8, just do a search in the LQ.org Redhat section for package management stuff, also, open a terminal and type "man rpm" then press enter key. Read it, press "q" to exit. There is a "man" (manual) page for every command on your system.
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