To present all categories (tags) from your publication, you can add a custom categories page.
The Reporter has a template for the Categories page, which shows all of the categories (tags) of your publication. A categories page is not required, but you can add it if you want.
To create the Categories page:
Go to Pages from the admin menu
Click the New page buttonin the top right corner
Add a title (e.g. 'Categories' or 'Tags')
If you want, you can add featured image for this page
Click icon in the top right corner to open the Page settings
Add a small description text (inside excerpt) if you want
Click the Template selector and choosethe Categories option
Click Publish
Starting with Ghost 6.0, themes will only receive a maximum of 100 categories for display on categories page.