Welcome to Perl and PerlMonks, Ookma-Kyi!

After some Googling I find that most of the suggested books are from 2010-2017 which leads me to believe the books are either old or Perl itself hasn't been updated in a long time.

Perl recieves a lot of updates - Perl 5.36 was released less than a year ago, and 5.38 is slated to come out this year. However, Perl 5 also places a large emphasis on backwards compatibility, so most of the material in older books still applies. Some best practices have evolved, so for example if you find code that looks like open FILE, ">$file" instead of open my $fh, ">", $file, then that's a good sign the example might be a little outdated, or especially if you find material that doesn't include a recommendation of use strict; use warnings;.

If you're only going to read one book, then I suggest Modern Perl. If you want to go deeper, then see threads like So what is your Perl book "Trilogy" anyway? and especially the links in eyepopslikeamosquito's reply will give you lots of good recommendations, and here's my take.

And of course you're always welcome to ask here!

My ultimate goal is to is use use the Perl equivalent of Django/Spring Framework/Ruby on Rails to create a browser based mmo game.

I personally like Mojolicious very much; after the above materials you can get started with Mojolicious::Guides::Tutorial.