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In terms of provisioning keywords, the directory name is second only to the domain name. This is an important aspect of site structure and navigation.
You should remember in SEO sunflower book www.seo-seo.com.cn "Google How to Find" section (PAGE 55), how Google is based on the PageRank such as fairy dust climbed the page. You should also remember that good sites are like the metaphor of a symmetrical tree (the directory is the trunk and the page is the leaf). My advice (for your site's unsecured section, http: part) is:
• Limit site depth to four levels as much as possible (for example, for any given page, you can navigate from the homepage one step at a time without more than three clicks). If possible, try to achieve three levels.
• Site spans are limited to 8, and site spans are the maximum number of pages that can be navigated by each page.
• This total number of pages is 1+ (83) = 513, which is sufficient in addition to the content of a very rich site.
• If your site is very large, please go to my forum for advice, I will be happy to give help (in general, as long as the increase can be, such as 5 levels of 10 spans).
• For the four-level site structure (consistent with what I'm talking about), I use the following terms to describe different levels (based on an excellent joomla! Content management System)
• Home (Homepage)--The most important page in the site.
• Secure Server Page for online subscriptions (Google won't crawl).
• Pages that can be accessed after logging in (Google does not crawl).
• Sitemap (link to page).