Rundown: systemd
List enabled systemd services
1systemctl list-unit-files --state enabled
Check a service
1sudo systemctl status mpd
Recognize service changes
1sudo systemctl daemon-reload
Start a service (it stops when the computer shuts down)
1sudo systemctl taskd.service start
2sudo systemctl daemon-reload
Find out why the computer takes so long to start
1sudo systemd-analyze
2sudo systemd-analyze blame