Custom 404 page

Write the page your host shows for missing URLs.

layouts/404.html renders /404.html, with the home page as page:

layouts/404.html
{% extends "baseof.html" %}
{% block main %}
  <h1>Page not found</h1>
  <p><a href="{{ site.home.rel_permalink }}">Go to the home page</a></p>
{% endblock main %}

GitHub Pages, Netlify, Cloudflare Pages and most hosts serve /404.html for missing URLs without configuration. fugo server serves it too. A multilingual site gets one per language (/th/404.html).