T01
Warning: mysqli_error() expects exactly 1 parameter, 0 given
Error:

$query_sched = "SELECT * FROM Team WHERE TID = $TID";
                    $sched = $dbc->query($query_sched);
            if ($sched === false){
                // error occured;
               echo "Error: ".mysqli_error();
                   exit;
            }
            $row = mysqli_fetch_array($sched, MYSQLI_ASSOC);

            echo '<tr>
                <td>' . $row['name'] . '</td>
                <td id="cellright">' . $teams[$i][1] . '</td>
                <td id="cellright">' . $teams[$i][2] . '</td>
                <td id="cellright">' . number_format($wnpctg,3) . '</td>
            </tr>';
        }

"SELECT * FROM Team where TID = '$TID'"

$sched = $dbc->query($query_sched);

if ($sched === false){
    // error occured;
    echo "Error: ".mysqli_error($link);
    exit;
}

$query_sched = "SELECT * FROM Team where TID = $TID"; using double quotes.