cd /etc/nginx/sites-available
ls -l
-rw-r--r-- 1 root root 2074 dateredacted default
-rw-r--r-- 1 root root 2092 dateredacted example.com
-rw-r--r-- 1 root root 1524 dateredacted t.example.com

cd /etc/nginx/sites-enabled
ls -l
lrwxrwxrwx 1 root root 52 dateredacted example.com -> /etc/nginx/sites-available/example.com
lrwxrwxrwx 1 root root 54 dateredacted t.example.com -> /etc/nginx/sites-available/t.example.com

vi /etc/nginx/sites-available/t.example.com

server {
        listen 80;

        server_name t.example.com;

        root /var/www/vhosts/t.example.com/httpdocs;

        access_log /var/www/vhosts/t.example.com/logs/access.log;
        error_log /var/www/vhosts/t.example.com/logs/error.log;

        index index.html;
}

cat /var/www/vhosts/t.example.com/httpdocs/index.html
index

cd /var/www/vhosts/
chown -Rf www-data:www-data t.example.com
chmod -Rf 755 t.example.com

nginx -t
nginx: the configuration file /etc/nginx/nginx.conf syntax is ok
nginx: configuration file /etc/nginx/nginx.conf test is successful
systemctl restart nginx