Domain pointing to Digital Ocean – Nginx

Very simple steps

server {
    listen 80;
    listen [::]:80;

    root /var/www/html/sub.example.com;
    index index.php index.html index.htm index.nginx-debian.html; 

    server_name sub.example.com www.sub.example.com;

    location / {
            try_files $uri $uri/ =404;
    }
    location ~ \.php$ {
        #NOTE: You should have "cgi.fix_pathinfo = 0;" in php.ini
        include fastcgi_params;                
        fastcgi_intercept_errors on;
        fastcgi_pass unix:/run/php/php7.2-fpm.sock;
        fastcgi_param SCRIPT_FILENAME 
                $document_root/$fastcgi_script_name;
    }
}

3. Run this  ln -s /etc/nginx/sites-available/sub.example.com /etc/nginx/sites-enabled/sub.example.com

4. Test configuration       sudo nginx -t

5. Restart Nginx server    sudo systemctl restart nginx