This document discusses site crawling tools and techniques. It provides information on various crawling tools, their uses, and pricing. Key things to look for when crawling a site include errors, redirects, duplicate titles and content, canonicals, image alt text, and PDF files. The document recommends crawling sites at minimum every quarter, before and after major updates, and if there are changes in organic traffic. Crawling can be used to test sitemaps, backlinks, and conduct content inventories.