useradd -M user
usermod -L -s /bin/false user
usermod -aG user www-data
chown -R user:user /var/www/example.com/public_html/
chmod -R u=rwX,g=rX,o= /var/www/example.com/public_html/ 
chmod -R 400 wp-config.php
sudo cp /etc/php/8.0/fpm/pool.d/www.conf /etc/php/8.0/fpm/pool.d/example.com.conf

[example]
user = user
group = user
listen = /run/php/php8.0-fpm-example.sock

edit other parameters as needed