Internal Linking - content,Sidebar, Footer

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Contexual linking
A contextual link is simply a link within the content of your website. By using them properly, you can help pages rank higher for specific key phrases and increase the usability of your website. Studies have shown that website users are more likely to click on contextual links. They cite contextual links as feeling more “natural” than search bars or navigation columns. This makes sense. If as you introduce new products, services or ideas you incorporate contextual links to pages further exploring these facets, the flow from one page to another feels seamless.

For example, I might write: “Due to the ever changing nature of search engines, there is always demand for search engine optimization consultants.” In this example, the anchor text “search engine optimization consultants” has a high search volume, and it leads back to the LunaMetrics webpage, as LunaMetrics is a SEO consultant company.

Sidebar
Sidebar links are another way for you to try to boost the value of internal site pages.The value of a sidebar link is not going to be as high as the value of an in-text, contextual link.The fact that the link repeats with the same anchor in the same location across multiple pages diminishes the overall effect. This is not to say to avoid using them, for they are good ways to bring site visitors into the content you wish them to see. Just do not expect to see a tremendous lift from the use of sidebar links – they do not seem to send that strong of a signal to the search engines. Use them to improve the usability and connections within your site content and it will certainly be what the search engines want to see as well.


Footers
The Footer is a great place to add a collection of links to the most valuable content on you site.Footer links are much like sidebar though, in that they tend to use value through the repetition of anchor text and page location.
From the user side that the footer is a place that often holds information about the site's owners, contact information,and legal stuff.It is depends on you that how you use the footer links of your site ?use your footer links springly, and you will see better results.