[ecommerce]

I have come to the conclusion that im confused.

Can someone explain to me in easy to understand terms why all these exists and how it affects the store:

im on 4 0 18 on the inside the xcart folder i have

1.
xcart/home.php - this file has if...include statements.
has no html structure.
Whats this for?
What does it control?
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2.
then inside cart folder again theres
xcart/custmer/home.php
this file has only

header("Location: ../home.php".(!empty($QUERY_STRING) ? "?".$QUERY_STRING : ""));
?>

Whats this for?
What does it control?
=================================

3. then i have
xcart/skin1_original
in here i have a bunch of folders, many tpls, etc.

=================================


4. then i have
xcart/schemes/
in schemes theres, folders, colors, digbats, templates
in templates, there 2 column , 3, small_shop
Whats schemes and there stuff for? if we have skin1 folder

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5. then theres skin1
how does xcart know to use skin1 or skin1_orig
is it the config.php file that tells it what to use?