If your article uses tags, these can also be shown on the article page itself. To enable this, toggle the checkmark next to 'Display tags on Page' beneath the list of tags. The tags will then be shown below the title (and subtitle, if there is one).
By default, this setting is unchecked. You can enable this for new pages in the newsroom settings. This will not apply to already created pages retroactively.
Clicking the tag will take the visitor to the tagged archive page of that tag.
By default the position of the tags is beneath the title and/or subtitle, but this can be changed in the Page Layout overview.