Options -Indexes
RewriteEngine On
RewriteBase /

# Product slug URLs
# /product/my-book-title  ->  product.php?slug=my-book-title
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^product/(.+)$ product.php?slug=$1 [L,QSA]