Categorizing content is a great way to allow users to find all content grouped by a specific term. Adding Taxonomy in Drupal gives us this ability by adding Vocabularies with Terms that we can add as a field to content types. However, to add a term field to our Post content type, we need to first create a Taxonomy.
We can begin by navigating to /admin/structure/taxonomy or using the Admin toolbar and clicking on Manage - Structure, then selecting Taxonomy:
Taxonomy terms are grouped into vocabularies and by default Drupal provides us with the Tags vocabulary. Vocabularies contain terms, which is just the name used to identify the piece of content within that specific category.