When I try to load [Button press] of VIEW ON GOOFLE MAPS, the map area begins to load, then stops immediately and the users sees:

Oops! Something went wrong.
This page didn't load Google Maps correctly. See the JavaScript console for technical details.

This same thing happens on Safari, Firefox, and mobile devices.

AFTER POSTING, I think I found answer. Will this work?

To place the key, you'll need to override the google_map block's controller.php file, adding in the key to the script that is output by the registerViewAssets function.

- Create a folder google_map in /application/blocks
- Copy the controller.php file from /concrete/blocks/google_map/ into this new folder
- Rename the namespace the top of this file to:
namespace Application\Block\GoogleMap;
- Find the location where the script is output in the registerViewAssets function, and add in the key to the end of the script:
public function registerViewAssets($outputContent = '')
{
$this->requireAsset('javascript', 'jquery');
$this->addFooterItem(
'<script defer src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY"></script>'
);
}