I have a Fedora 28 system (EDIT: upgraded from Fedora 27, rather than installed fresh). I can run
dnf list --installed to list the 2165 packages installed on my system. I can run
dnf leaves (using the leaves plugin) to list all 368 packages which were installed in their own right, rather than as dependencies of something else.
The list of leaves includes both things like
sudo-1.8.22-0.2.b1.fc28.x86_64, which is a pretty essential part of the system, and things like
steam-22.214.171.124-17.fc28.i686, which is not, and is there because i installed it myself.
Does Fedora / RPM / dnf have the idea of "packages which are part of the base system" as opposed to "packages which a user asked for"? If so, is there any way to list all the latter packages? If not, is there some other way to produce that list, even approximately?
My ultimate goal is to clean up my system by removing old packages i installed but no longer need. The problem is that i have no idea what i've installed.