Add a taxonomy to config.toml.

[[taxonomies]]
name = "tags"
url = "tags"
feed = false

For multilingual sites, add the same taxonomy under each language.

[languages.ja]
taxonomies = [
  { name = "tags", url = "tags", feed = false },
]

Then add tags in post front matter.

+++
title = "Post title"
date = 2025-08-01

[taxonomies]
tags = ["foo", "bar"]
+++

Zola generates /tags/ and each tag page.