The Perl Programming Language - www.perl.org
Perl programming documentation - perldoc.perl.org
First steps - learn.perl.org
Beginner's Introduction to Perl - Perl.com
Perl Cookbook
The Perl Renaming Debate Highlights Tensions Raku is alias for Perl 6
Modern Perl Programming
PerlMonks - The Monastery Gates
Perl Maven - for people who want to get the most out of programming in Perl
Perl tutorial
Mojolicious::Guides - The Mojolicious Guide to the Galaxy
perlthrtut - Tutorial on threads in Perl
Why I’m Learning Perl 6 – Evan Miller
Package Manager
The Comprehensive Perl Archive Network - www.cpan.org
Search the CPAN - metacpan.org