Fedora 30
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Initial Settings : Services2019/05/06

[1] It's possible to display services' status like follows.
# the list of services which are active

[root@dlp ~]#
systemctl -t service

UNIT                            LOAD   ACTIVE SUB     DESCRIPTION
abrt-journal-core.service       loaded active running Creates ABRT problems fro
abrt-oops.service               loaded active running ABRT kernel log watcher
abrt-xorg.service               loaded active running ABRT Xorg log watcher
abrtd.service                   loaded active running ABRT Automated Bug Report
atd.service                     loaded active running Deferred execution schedu
.....
.....
user-runtime-dir@0.service      loaded active exited  /run/user/0 mount wrapper
user@0.service                  loaded active running User Manager for UID 0

LOAD   = Reflects whether the unit definition was properly loaded.
ACTIVE = The high-level unit activation state, i.e. generalization of SUB.
SUB    = The low-level unit activation state, values depend on unit type.

48 loaded units listed. Pass --all to see loaded but inactive units, too.
To show all installed unit files use 'systemctl list-unit-files'.

# the list of all services

[root@dlp ~]#
systemctl list-unit-files -t service

UNIT FILE                                   STATE
abrt-ccpp.service                           disabled
abrt-journal-core.service                   enabled
abrt-oops.service                           enabled
abrt-pstoreoops.service                     disabled
abrt-vmcore.service                         enabled
abrt-xorg.service                           enabled
abrtd.service                               enabled
arp-ethers.service                          disabled
atd.service                                 enabled
auditd.service                              enabled
.....
.....
[2] Stop and turn OFF auto-start setting for a service if you don'd need it. (it's smartd as an example below)
[root@dlp ~]#
systemctl stop smartd

[root@dlp ~]#
systemctl disable smartd

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