// 1 plik

$hostName = 'localhost';
$userName = 'root';
$password = 'coderslab';
$dataBase = 'exercises_db';
$conn = new mysqli($hostName, $userName, $password, $dataBase);

if ($conn->connect_error) {
    die("Connection Error!  " . $conn->connect_error);
}

$sql = "SELECT * FROM product";
$result = $conn->query($sql);

foreach ($result as $product) {
    echo("nazwa: " . $product["name"]) . " opis: " . $product["description"] . " cena: " . $product["price"] . "<br>";
    echo "<a href='delete.php?id= $product[id]&tablica=product'>Delete " . $product["name"] . "</a> <br>";
}

$conn->close();

// 2 plik

<?php

$hostName = 'localhost';
$userName = 'root';
$password = 'coderslab';
$dataBase = 'exercises_db';
$conn = new mysqli($hostName, $userName, $password, $dataBase);

if ($conn->connect_error) {
    die("Connection Error!  " . $conn->connect_error);
}

$tabela =($_GET['tablica']);
$id =($_GET['id']);



$sql = "DELETE FROM $tabela WHERE $id";

$result = $conn->query($sql);