nginx[3733]: nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use) code example

Example 1: nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use)

sudo pkill -f nginx & wait $!
sudo systemctl start nginx

Example 2: nginx: [emerg] bind() to 0.0.0.0:8080 failed (48: Address already in use)

sudo launchctl unload -w /System/Library/LaunchDaemons/org.apache.httpd.plist