Internal Links
These are called internal because they establish connections between different sections and posts on the same site. As a blogger, you have more control over internal links than external links.
Internal links are essential for helping your audience navigate between sections and pages on your website, meaning that you can use these resources to improve the user experience of your audience.
Benefits
I - Provide Ease of Navigation - Internal links help improve the ease with which users move around your website. They can easily move from one section to another or from one page to the other.
II - Easily Revive Old Posts - This linking is a great strategy that can be implemented to revive blog posts that you wrote in the past.
It could be that these old posts have not been getting recent views or they cover topics that are currently trending. And all you need to do is link new posts to the old ones.
That way, you will be able to stimulate the interest of the old ones and possibly boost traffic to them.
III - Useful for Creating Logical Structure for Your Blog
Internal links are great tools that can be used to create a logical structure for your blog. A well-designed internal linking produces a comprehensive sitemap for your blog – one of those factors that affect how well your site will be crawled by search engines.
IV - Lower Bounce Rate
If you link the pages and sections very well, you'll be able to keep visitors longer on your site. They will find it easy to navigate from one piece of content on your site to another.
This will result in a lower bounce rate and provide a boost to your search ranking.
Drawbacks
I - Requires Serious Planning and Execution
An internal linking system is never an afterthought but a well-planned strategy from the beginning. And if you do it any other way, you may end up with a poorly-structured linking system.
II - Irrelevant Links
If the anchors used for linking posts or sections are irrelevant, then the purpose of linking is defeated.