Hi,
There are a number of reasons why people install WAMPServer. Those that know how to develop web site under Apache/MySQL/PHP and those that dont yet know how to do this.
I think you fit into the second group.
There are 100's of things that you can configure in Apache and also 100's of configurations for MySQL and PHP.
If you are not yet familiar with web sites under Apache and how they work, it is your job to read the manuals, work out how things work. It is not our job to lead you by the hand in this learning process.
But here is your first lesson:
If you want a script to run automatically when you enter the domain name
'http://my-site` in your browsers address bar you call that script
"index.php".
You then add menus of some sort to that script using HTML/Javascript etc so that a user can jump to individual pages/script in your website.
Using this new found knowledge you should be able to work out that if you change the script `HelloWorld.PHP` to be called `index.php` your issue will be solved without any configuration chnage at all.
Also it is best to use lower case for all your web page file names.
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(Windows 10 Pro 64bit) (Wampserver 3.3.4 64bit) Aestan Tray Menu 3.2.5.4
<Apache versions MULTIPE> <PHP versions MULTIPLE> <MySQL Versions MULTIPLE>
<MariaDB versions MULTIPLE> <phpMyAdmin versions MULTIPLE> <MySQL Workbench 8.0.23>Read The Manuals Apache --
MySQL --
PHP --
phpMyAdminGet your Apache/MySQL/mariaDB/PHP ADDONs here from the
WAMPServer alternate Repo-X-X-X-
Backup your databases regularly Here is How dont regret it later! Yes even when developing -X-X-X-