My only comment is that you please add the 'use strict;' and 'use warnings;' lines to your hello world script. Even if you gloss over them with a "well talk about those more later" comment.
I started down my Perl path without strict or warnings. When I started to see them in use (and use them myself) it was awkward annoying (all those new warning messages to wade through). It wasn't until later that I finally came to realize those warnings were for my own good and learned to embrace strict/warnings. It would have been easier and more productive to learn that lesson from day one.
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