How to get started with PhpSpreadsheet?

Question

phpspreadsheet

A friend suggested PhpSpreadsheet to work with spreadsheets.
I uploaded the whole folder to the hosting (to the domain folder, there is no site on the domain), created index.php
Googled the following way to get started

<?php
require_once($_SERVER['DOCUMENT_ROOT'].'/PhpSpreadsheet-master/src/PhpSpreadsheet/Spreadsheet.php');
?>

But the page is empty
. In php, it's completely zero
Documentation didn't help me
How to start working with PhpSpreadsheet?

Answer 1

You can show any link to any resource useful in your task, for example: https://php-download.com/package/phpoffice/phpspre... - my version of connecting this library.
But if you are a complete zero in php, then it all makes no sense, because PhpSpreadsheet can only be used through php code.
How could you even think of doing this?