Can anybody please explain (my $self = shift) in Perl

Question

I\'m having a really hard time understanding the intersection of OO Perl and my $self = shift; The documentation on these individual elements is great, but none of

Answer 1

If you call:

$myinstance->myMethod("my_parameter");  

is the same that doing:

myMethod($myinstance, "my_parameter");  

but if you do:

myMethod("my_parameter");  

only "my_parameter" wil be passed.

THEN if inside myMethod always you do :

 $self = shift @_;  

$self will be the object reference when myMethod id called from an object context
but will be "my_parameter" when called from another method inside on a procedural way.
Be aware of this;