Another suggestion that I would make is ... to look at as much Perl code as you can reasonably get your hands on.   For example, if you are searching for a CPAN library (http://search.cpan.org) that interests you, notice the (Source) hyperlink on that page.   Click it, and you get a glimpse of the source-code behind the scenes.   Just ... browse it.   Don’t try to understand it all.   Some of it’s wunnerful, and some is not.   But it is real, production code.   “You learn a lot by watching.”