# Turning an arrayref into an array
my @arr = @$aref;
# Extracting a single value from an arrayref
print ${$aref}[0];
# Or, more readable and less problematic:
print $aref -> [0];
# Looping over the pointed-to list
for my $i (@$aref){
    ...
}

##</code><code>##

$aref = [
          [
            1,
            2,
            3
          ],
          [
            4,
            5,
            6
          ],
          [
            7,
            8,
            9
          ]
        ];

##</code><code>##

for my $deref (@$aref){
    for my $element (@$deref){
        print "$element\n";
    }
}