Trying to automate Let's Encrypt cert renewal .. Webroot?

Hey guys. Running HASSbian and am trying to do auto renew Let’s Encrypt cert renewal:

/root/.local/share/letsencrypt/bin/letsencrypt certonly --webroot \ 
--webroot-path /var/www/example --renew-by-default --email \
[email protected] --text --agree-tos --agree-dev-preview -d \
site.example.org -d www.site.example.org

Can someone tell me what the path to webroot is?