"Any documentation I could read ..."

I assume from this statement that there's some documention you can't read (or, more likely, find or access). Here's some options:

With internet access:

• http://perldoc.perl.org/perl.html — Perl documentation for the current production version (there's a slight lag whenever a new version is released). Has links to earlier versions.
• Perl functions A-Z — easier to navigate, and far less to download, than the full perlfunc manpage.

Without internet access, the perldoc utility is still available from the command line. It should give you the documentation for whatever version of Perl you're using. At least the first, but probably both, of these should work for you:

• $ perldoc perldoc
• $ man perldoc