This document lists 20 pieces of advice over Perl's 20 year history, including warnings such as "don't get involved in a land war in Asia" and tips like "make spreadsheets" with Spreadsheet::WriteExcel and "make tools" with modules like Test::More and CPAN. It highlights some of Perl's milestones from 1997-2009 like the creation of NY.pm and the first YAPC conference.