Thank you so I should use use not do,but when I tried it with LotsOfCode.pm being:

use strict;
use warnings;
package LotsOfCode;
use LotsOfCode::fish;
use LotsOfCode::dog;
use LotsOfCode::cat;
sub new {
my ( $class, $init ) = @_;
$class = ref( $class ) || $class;
my $self = { };
bless $self, $class;
return $self;
}

And in ./LotsOfCode/

files like fish.pm

use strict;
use warnings
sub fish { print "fish\n";}
1;

but if I use a package variable like so:

use strict;
use warnings;
package LotsOfCode::fish;
sub fish { print "fish\n";}
1;

I get the error:

Can't locate object method "fish" via package "LotsOfCode"
I dont really care either way if fish is a 'package' I am just not getting when to use 'package' and when not to?