Facing Problem In Installation

it means that there is an error in establishing database connection — double check username and password of database and even hostname where not all have localhost for hostname.

Typically each hosting provider has a different way of handling the database as far as it being localhost or a URL ( example: mysql234.hosting.com). Either contact your provider or check where you setup your database as it may give you the logon credentials and URL you need.

Chances are it’s the hostname that’s getting you.

Make sure that you have filled up correct database details (database name, database user name, password, MySQL hostname, port) in wp-config.php file.