I quite enjoyed Perl Best Practices[0] for the rationales behind every decision, most of which I could get on board with. Plus, if you really like it you can auto-reformat code with perltidy[1] using the "--perl-best-practices" flag or check your files with Perl::Critic[2] policies based on PBP.

It's dear to me because it came along at a time when I needed short breaks from thesis writing.

  [0] https://www.oreilly.com/library/view/perl-best-practices/0596001738/
  [1] https://metacpan.org/dist/Perl-Tidy/view/bin/perltidy
  [2] https://metacpan.org/pod/Perl::Critic