You might want to take a look at perlreftut before you look at perlref.

perlreftut is the Perl references tutorial. It's shorter than perlref and leaves out a lot of stuff that is rarely used. It also has a simple example.

It should be available in your documentation set that you got with Perl, but if you can't find it, it's available online at http://www.plover.com/~mjd/perl/FAQs/References.html.

$array_2d = [[a, b, c], [d, e, f], [g, h, i]];
for $l (0..2) {
    for $c (0..2) {
        print $array_2d->[$l][$c];
    }
}
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