Page not found Django - How to fix?

Question

Django

There is a snippet of HTML code (menu element for navigating through pages)

<li class="nav-item">
   <a class="nav-link" href="aboutus.html">О НАС</a>
</li>

When opening this page (this is not the main Django page) - this error appears:

I tried to enter the full location of the page, it still did not help.
What might be causing this error?

Answer 1

404 means that there is nothing at this address, check the link if there is a file at the address to which the link refers

Answer 2

We read carefully and thoughtfully https://docs.djangoproject.com/en/4.0/topics/http/urls/