I think you can learn most/all of Perl 5.32 with http://modernperlbooks.com/books/modern_perl_2016/ , and it appears this is, initially, going to be 5.32 with some saner defaults. So you could really start now, given that.

> This beloved guide is now completely updated for Perl 5.22.

I've been working with Perl since about 5.20 and am on 5.31 or 5.32 and haven't noticed many breaking changes FWIW.