Those are good examples of using references. I have one correction and one addition.
 

    my $first = @{$ref_to_array}[0]; # prefix That should be: my $first = ${$ref_to_array}[0]; # prefix Just like with a regular array, you should use $ when accessing a single element, and save @ for when you want a slice.
 

    # the easy way
    $LoL[0]->[0]->[1]   = 'It's a bird, it's a plane, it's...';
    # the shortcut
    $LoL[0]->[0][2]     = 'Superman!';
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To finish the abbreviation:

# the full shortcut
$LoL[0][0][2]     = 'Superman!';
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