Perl is a language where you can just try out things. You are encouraged to do so.

What package does it belong to?

The package it is being declared in. You can find that out with

print __PACKAGE__, "\n";
[download]

Now , if I use strict, is it required to use main before the $anything ($main::anything) ?

Try it out!

Or does main mean main body (and not subroutines) of program that we are dealing with ?

No. Packages can be only changed with the package declaration. Declaring a subroutine doesn't change the package at all.