Things you might want to look at for Perl - Moose/Moo for OO, Mojolicious/Dancer/Catalyst for web frameworks, DBIx::Class/Rose::DB::Object for ORMs, App::cpanminus/App::perlbrew/local::lib for managing installations of Perl and modules, and http://metacpan.org/ for looking up libraries for everything else.

Also, the free book "Modern Perl" to get a feel for the language in 2013 as opposed to the hundreds of horribly outdated .com-bubble era tutorials you'll find on google.

You'd be best with somebody else's advice for python or ruby, most likely, so I shan't opine there.