For search engine bots, text links are like doorways from page to page and site to site. This means websites are generally better indexed by search engines if their bots can traverse the entire site using text links. But there’s more to it than that. Links from top level pages like the ‘Home’ and ‘Products’pages carry more weight than links from lower level pages (e.g. the ‘5 tips to stay older’ page).The logic here is that if you link to a page from a top level page, you obviously want a lot of your visitors to see that link, so it must be key to your subject matter and business model.
Internal links also tell the search engines what pages are important. In other words, if you link to a page again and again and again, and you use meaningful anchor text, Google will assume that page is a core part of your subject matter, and index you accordingly. What’s more,every time you link to a page, it’s passed a bit of PageRank. Link to it enough, and it will become one of your higher ranking pages, as it develops ‘link equity’.
Limit links to fewer than 100 per page. Jakob Nielsen’s advice is ''include links to other resources that are directly relevant to the current location. Don't bury the user in links to all site areas or to pages that are unrelated to their current location.” Place your links prominently on each page. The search engines pay more attention to links toward the top of the page, and visitors are OK with prominent links too.Consider adding a nofollow to links that point to less important pages, so that the search engines don’t visit those pages. This increases the relative link equity of all your other pages.
A nofollow looks like this: <a href="page1.htm" rel="nofollow">Go To Page 1</a>
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