G'day anek77713,

"Can someone give me a hint?"

One of the first tools I reach for when seeking Perl information is Perldoc. This is available online from http://perldoc.perl.org/perl.html (I recommend you bookmark this) and as the commandline utility perldoc.

"What should I read to learn building modules over existing ones?"

This is very vague: "building" (writing? creating? other?); "over" (on top of/replacing? instead of? subclassing? other?); "existing" (builtin? CPAN? in-house? other?).

Under the Reference Manual section of the link I provided above, you'll find a block of six links whose descriptions all start with "Perl modules:":

• perlmod Perl modules: how they work
• perlmodlib Perl modules: how to write and use
• perlmodstyle Perl modules: how to write modules with style
• perlmodinstall Perl modules: how to install from CPAN
• perlnewmod Perl modules: preparing a new module for distribution
• perlpragma Perl modules: writing a user pragma

One or more of those may well provide the information you're looking for. If not, please ask a more specific question.

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