A 404 Error - Page not found shows when the page requested does not exist. 404 pages are usually quite straightforward but some companies show a creative 404 error page. The most important is to let the user and Google know about it while helping the user to find his way fast. For example here for Zalando:

404

In order to avoid such pages:

404 Not Found

You would need to render a catch-all page for pages not yet covered. For example in Node.js:

app.all("*", function(req, res) {
    res.status(404).render("error");
});








Alex Bieth, Owner @ SEO Berlino and SEO Consultant