From the concept of Search Engine Optimization, internal linking holds great importance. Internal linking is beneficial because:
It is a great way to increase user engagement on your blog.
It increases the page views of a single visitor and hence results in the decrease of a bounce rate.
It helps in the ranking of your blog post as you have more information regarding your keyword.
Internal Linking can be harmful if you place the wrong internal links to trap Google and your target audience. Your ranking might get disturbed by placing the wrong interlinks.