How do I list the reserved tables already registered?

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HTML

PHP

MySQL

Hello I am new here and I really need help if something is wrong in the question let me know and I will fix it. Well I'm trying to display all registered tables on a screen of my website and I'm not getting it, I'm using the MVC model so I need an orientation for me to know if I'm doing it right or not. I'm going to send all the classes I'm using for list and the html I use.

HTML Perfil.php

<form name="formcad" class="needs-validation"  novalidate method="POST" action="PHP/Classes/ListarReserva.php">
<button class="tablink" onclick="openPage('VerReservas', this, 'chocolate')" >Ver Reservas</button>
</form>

<div id="VerReservas" class="tabcontent">

I wish that when he entered this Ver Reservation he could directly display the registered reservations
  
</div>

I wish that when he entered this Ver Reservation he could directly display the registered reservations

ListarReserva.php

<?php

include 'ReservaDAO.php';
include 'Reserva.php';


$Reserva = new Reserva();

$ReservaDAO = new ReservaDAO();
$ReservaDAO->ListarReservas($Reserva);

?>

ReservaDAO.php

 public static function ListarReservas($Reserva)
    {
        $connection = Connection::getConexao();
        $sql = "SELECT * FROM reserva";
        // Listar Todas as reservas
        $result = mysqli_query($connection, $sql);
        $reservas = array();
        while ($reserva = mysqli_fetch_object($result)) {
            if ($reserva != null) {
                $reservas[] = $reserva;
            }
        }
        return $reservas;
    }
?>

Connection.php

<?php

include 'ReservaDAO.php';
include 'Reserva.php';


$Reserva = new Reserva();

$ReservaDAO = new ReservaDAO();
$ReservaDAO->ListarReservas($Reserva);

?>

If you need any more data let me know and I'll post it here ok.

What I have tried:

I just tried to give a basic selection for him to display but he does not display and keeps giving this error:


Warning: mysqli_query() expects parameter 1 to be mysqli, object given in C:\wamp64\www\Rapid\PHP\Classes\ReservaDAO.php on line 30


Warning: mysqli_fetch_object() expects parameter 1 to be mysqli_result, null given in C:\wamp64\www\Rapid\PHP\Classes\ReservaDAO.php on line 32