Another consideration of internal linking in conserving or distributing link weight.
Most websites have the majority of inbound links directed at their index page. So take a look at your index page. Are all you’re most important pages linked to from your index page? Or are your most important pages a couple clicks away?
Follow this simple formula:
The more important the page, the more occurrences of links to that page within the site. The less important the page, the less frequent the number of links.
Some pages, such as Terms Of Service or Acceptable Use Policy pages, need not have a link from each page. And links to external sites should be kept at a minimum.