services

You can use the service or systemctl commands to work with these. Apparently systemctl is more direct and service is a wrapper script.

   systemctl start|stop|restart|status service

To find out if a service is enabled / will start up at boot

   systemctl is-enabled service

To enable|disable it at boot

   systemctl enable|disable service

logs

To filter by unit (a unit can be all kinds of stuff)

   journalctl -u service|username|groupname

show all information (instead of truncated)

   journalctl -a

to throw the output to stdout instead of the less pager

   journalctl --no-pager

to follow output live

   journalctl -f