Package manager dnf

# dnf check-update
# dnf -y --exclude kernel-* upgrade
# dnf reposlist
# dnf search <STRING>
# dnf list 
# dnf info <PACKAGE>
# dnf install <PACKAGE>

Fedora release

$ cat /etc/fedora-release

Install system upgrade DNF plug-in:

# dnf -y install dnf-plugin-system-upgrade

Release upgrade:

# dnf -y --refresh upgrade
# dnf -y system-upgrade download --releasever=<N>
# dnf system-upgrade reboot

# Devices > Insert Guest Additions CD image ...
$ su -
# cd /run/media/jani/VBox_GAs_5.2.22
# ./VBoxLinuxAdditions.run