The relevant POD's, included with every complete distribution of Perl:

• perldsc - The Perl Datastructure Cookbook
• perlref - Perl References
• perlreftut - Perl References Tutorial
• perllol - Perl Lists of Lists Tutorial

That should keep you busy for a couple of hours, after which, you'll feel at first like you were struck in the head by a phone book and told to memorize it. But a couple hours later, a lightbulb will flick on, and you'll get it. (teasing, of course -- but these are very informative reads)