Once you have added tags or taxonomy terms to your content, there are many different ways to make use of them. One option is to create a tag cloud, another option would be a menu block based upon a specific vocabulary.
We have a video that explains a few options for using Taxonomy Terms to help users navigate your site and find relevant content.
We have a blog post on this topic available at: https://simplo.site/posts/use-taxonomy-terms-navigation