Starting
sudo systemctl start application.service
or simply
sudo systemctl start application
Stopping
sudo systemctl stop application.service
sudo systemctl restart application.service
If the application in question is able to reload its configuration files (without restarting), you can issue the reload command to initiate that process:
sudo systemctl reload application.service
The above commands are useful for starting or stopping commands during the current session.
sudo systemctl enable application.service
sudo systemctl disable application.service
systemctl status application.service
systemctl is-active application.service
systemctl is-enabled application.service
systemctl is-failed application.service
sudo systemd-analyze verify application.service
sudo journalctl -u application.service