Error while running php -S localhost:9000 while running WordPress site locally:
The requested resource / was not found on this server.
The solution is to make sure that you have index.php at the root of your site and you are running php -S localhost:9000 at the location where the index.php page is, sometimes the terminal is at tone level up of the root site and you are running php -S localhost:9000 over that directory. You need to run the command where the actual WordPress site directory is present.