Internal linking

7 things that must be present in your site are internal linking structure.

 Keep a shallow website structure.

 Nowadays, users are very demanding when it comes to the speed of websites, including page load time and the time required to complete certain actions. They expect to complete their goals fast. 

To check your pages' click depth, fire up WebSite Auditor. The tool will show you how many link clicks it takes to reach any given URL

Make sure all the important pages are linked

search engines rely both on sitemaps and links to discover web pages. It means that even unlinked — or the so-called 'orphan' — pages can be found by the search engines as these pages are listed in the sitemap. But it's impossible to find 'orphan' pages through the website's navigation. Such pages virtually don't exist for the users. It's a good idea to get rid of orphan pages; you can either delete them (if they are useless) or link them from other pages of the website.

Once the crawl is complete, you'll be able to find orphan pages in the Pages dashboard, marked with the Orphan page tag.

overall site's structure with one click with the Visualizationtool in WebSite Auditor. In your project, go to Site Structure > Visualization and immediately see whether you have orphan pages, long chains of pages, or any other soft spots in your structure:

links per page reasonable

More links, internal or external, are found on a page, the less link juice each link sends to the page it points to. Moreover, unless the content is well-structured, it may be boring for your visitors to scroll down an endless list of resources. To top it up, an excessive number of links can send a spam signal for search engines.

Use keywords in the anchor text

internal links act like backlinks, so using relevant terms in their anchors is a free and simple way to boost topical relevance.

Duplicate links to the same URL

several links on the same page that point to the same URL, search engines would give the priority to the first anchor text. Keep this in mind and use the right keywords in the first link's anchor: subsequent anchors won't matter as much.

Place links within pages

The links placed within page's content have a higher SEO value than the ones in the header, footer, or sidebar. The latter have more to do with navigation, and it looks like Google treats those as non-editorial links. Link in the main content, on the other hand, add new information and value to the text.