This document provides tips on optimizing facet navigation for ecommerce websites to target long-tail keywords and drive more traffic and sales. It recommends using keyword research to identify relevant facets, optimizing facet URLs and landing pages with long-tail terms, and linking to facet pages to build their authority and reduce reliance on other marketing channels. Done correctly, facet navigation optimization can help websites better serve consumer intent, improve the user experience and conversion rates, and open up new backlink opportunities.