Creating the correct linking structure within your website can help you ranking for keyphrases that are related to your website. If you think this means linking to every page on your website from every page on your website then you are wrong and you really need to read this article.
The process also known as link sculpting is the process of making the search engines detect which are your major pages within your website and the ones you consider to be the most important.
Your main navigation on your website should contain links to your most important pages. If you have too many links in your navigation then this will dilute the PageRank that you pass on to these pages. From these main pages lets take for example one of the main sections of your site was 'cars'. Then you would contain a link to this page in your main navigation, and then from here have a navigation menu that points to the sub sections of cars. For example makes of cars Ford, Audi and Volvo. This will help tell the search engines what pages are important and will pass some PageRank to these pages.
Let's take a minute to discuss how PageRank can be filtered through to other pages. If your homepage has a page rank of 2 then some of that PageRank will filler through to the pages you link to from this page. However the more pages you link to from your homepage the PageRank will be split between these pages and if you have too many links then the strength of the pages you link to will be diluted. This is why it is not a good idea to link to every page. One other point worth mentioning is that the PageRank of these inner pages will also be determined by other of-suite factors including the amount of links pointing to these internal pages from external sources.
To further strengthen your main pages link back to them from your Ford, Audi and Volvo pages. As this will also be an indicator to the search engines what are your main pages are.
There are other methods you can use to strengthen your website by using the no follow rule to tell Google not to follow certain links so they don't pass PageRank. The most important thing to remember is your website has to be useable to the website visitors and most of these techniques should ensure this.
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