Example of a "breadcrumb navigation" [Home>Category>Article]
Other ways to improve internal linking
You can clearly improve the internal linking by using a Sitemap improve. With the Sitemap there are also many different approaches. For search engines such as Google, it is recommended to use a Sitemap in the form of an .XML file. You can also look up the information regarding the Sitemap read up.
For your visitors we recommend a Sitemap in the form of a separate subpage (it does not matter whether the file extension is .html or .php). However, the use of a categorically organized directory also has clear advantages. However, you should make sure that these are also accessible so that they can be found by visitors. If necessary, set a link from the sidebar or link the Keyword directly from the Content.
You can find helpful plugins for SEO & internal linking in this post.
Internal linking error
You can also make mistakes with internal linking, make sure that you do not use any images or graphics for your navigation, for example. If it is essential, then the use of alt tags should definitely be considered. It is also important that if you use links from the Content does not use too long or stuffed with keywords Title tags to be created. This could possibly be Keyword-spam by the search engines and would miss the target to be achieved. Don't overdo it with the number of links placed in the content either, it's no good if you use one and the same Keyword linked several times in the article.
If you have something to say about internal linking, please write a comment with further links.