Can’t restart process with error

I need to restart the process. What do I do when I keep seeing these messages? Do you need more commands?

$   nginx nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use) nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use) nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use) nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use) nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use) nginx: [emerg] still could not bind()  $   service nginx start Job for nginx.service failed because the control process exited with error code. See "systemctl status nginx.service" and "journalctl -xe" for details.  $   systemctl status nginx.service ‚óŹ nginx.service - A high performance web server and a reverse proxy server    Loaded: loaded (/lib/systemd/system/nginx.service; enabled; vendor preset: enabled)    Active: failed (Result: exit-code) since Wed 2019-05-29 13:28:29 KST; 26s ago   Process: 24508 ExecStop=/sbin/start-stop-daemon --quiet --stop --retry QUIT/5 --pidfile /run/nginx.pid (code=exited, status=0/SUCCESS)   Process: 31955 ExecStart=/usr/sbin/nginx -g daemon on; master_process on; (code=exited, status=1/FAILURE)   Process: 31952 ExecStartPre=/usr/sbin/nginx -t -q -g daemon on; master_process on; (code=exited, status=0/SUCCESS)  Main PID: 13077 (code=exited, status=0/SUCCESS)  May 29 13:28:27 ip-172-26-12-170 nginx[31955]: nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use) May 29 13:28:27 ip-172-26-12-170 nginx[31955]: nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use) May 29 13:28:28 ip-172-26-12-170 nginx[31955]: nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use) May 29 13:28:28 ip-172-26-12-170 nginx[31955]: nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use) May 29 13:28:29 ip-172-26-12-170 nginx[31955]: nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use) May 29 13:28:29 ip-172-26-12-170 nginx[31955]: nginx: [emerg] still could not bind() May 29 13:28:29 ip-172-26-12-170 systemd[1]: nginx.service: Control process exited, code=exited status=1 May 29 13:28:29 ip-172-26-12-170 systemd[1]: Failed to start A high performance web server and a reverse proxy server. May 29 13:28:29 ip-172-26-12-170 systemd[1]: nginx.service: Unit entered failed state. May 29 13:28:29 ip-172-26-12-170 systemd[1]: nginx.service: Failed with result 'exit-code'.