Perl has great built-in documentation available via the perldoc command. If you run perldoc and then give it page it will display it. The following are good resources for someone new to Perl. In order: Syntax, Operators, Data Structures, Functions, Debugging, Variables, and Modules.

perldoc perlsyn perldoc perlop perldoc perldata perldoc perlfun perldoc perldebug perldoc perlvar perldoc perlmod
Many more are available at perldoc.com