404 page examples you need to see before writing your own.
How to Handle 404 'Not Found' Errors & Build Custom 404 Page
Getting 404 Error on my Published Project - Bugs - Forum
Daily UI 008: 404 Page. In case you missing an error 404 means:, by José Fitas UX
Documention
How To Fix A 404 Error Page
Error 404: What It Is and How to Fix It in Five Simple Steps
How to Fix 404 Error in WordPress • Page Not Found [Tutorial] - FastComet
How to Fix Error 404 Not Found on Your Site - Kinsta®