Error establishing a database connection (configuration)

I hope you can help me to fix my problem.

I am using WordPress for the first time, and I don’t know why I am getting Error establishing a database connection knowing that I have created the file wp-config.php by myself then I provided the information of my database.
I create a virtual host because I need to work just in localhost.

for the information: I am using the above version below:

WordPress 5.5.1 / wampserver 3.2.3 / PHP 7.4.9 / MySQL 5.7.31

thank you for your support!!!