The following lines were added (+) and removed (-):
Activate a service immediately: systemctl start fooDeactivate a service immediately: systemctl stop fooRestart a service: systemctl restart fooShow the status of a service including if it is running or not: systemctl status fooEnable a service to be started on bootup: systemctl enable fooDisable a service to not start during bootup: systemctl disable fooPrevent a service from starting dynamically or even manually unless unmasked: systemctl mask fooCheck if a service is already enabled or not: systemctl is-enabled foo