I always start my websites with Dancer2. Why? Because it provides virtually all the things i'll need later, like session handling. Consider the following:

#!/usr/bin/env perl
package App;
use Dancer2;

set session => 'YAML';

get '/' => sub {
    my $value = session( 'some.var' ) || 0;
    $value++;
    session 'some.var' => $value;
    return "The current value is $value";
};

start;
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The docs contain a complete working example for handling the logging in and out of user sessions as well: https://metacpan.org/pod/Dancer2::Manual#Sessions-and-logging-in

L-LL-L--L-LL-L--L-LL-L--
-R--R-RR-R--R-RR-R--R-RR
B--B--B--B--B--B--B--B--
H---H---H---H---H---H---
(the triplet paradiddle with high-hat)