[otrs] problem of understanding otrs-structure / pl. help

Hello otrs gurus, I must make a request for help because I can´t understand structure of otrs programming although I read develop- and admin-manual Befor I installed otrs, I had not been busy with perl... but I read perl manuals. a script begins with package name... package Kernel::Config; then comes a methode ... is understandable then... $Self->{'Customer::AuthModule::DB::User'} = "sysdba"; what is that ->{'Customer::AuthModule::DB::User'} ??? Is it a modul? where is this modul? in which dictionary? I have successful done the basic configuration, but i want advance my otrs. I can´t do it because I am lacking of traceability. I hope you to can help me Thank you!