Services

systemctl <tab> : overview of commands
systemctl -t help : unit types
systemctl lis-unit-files : all available unit
systemctl list-units : list of started units (and order)
systemctl status <service>
systemctl enable|disable <service> : start|stop service at init
systemctl start|stop <service> : start|stop service now

Configuration

systemctl cat <service>.service : show unit file
systemctl show <service>.service : show unit params
systemctl edit <service>.service : override service config
systemctl daemon-reload : realod after change

Target

systemctl start <targe>.target : start a target
systemctl get-default : get default target at startup
systemctl isolate <target>.target : keep only units required by target