You have a page. It is 404ing. It doesn't exist.
What should you do with those pages?
Google advises against redirecting all 404 pages to the homepage, recommending proper redirects or maintaining 404 status codes. Content has moved to a new location. Use a redirect to that specific new URL.
Use a 301 redirect if that is permanent.
If it's gone, don't redirect it to the homepage. When crawlers encounter a legitimate 404, they recognize that the content no longer exists, so redirecting them to the homepage creates a confusing loop.
Head to YouTube for the full video.