The cart pagefile path: app/design/frontend/base/default/template/checkout/cart.phtmllayout handle: <checkout_cart_index>the login area: app/design/frontend/base/default/template/customer/form/login.phtmllayout handle: <customer_account_login>the user account registration page: app/design/frontend/base/default/template/customer/form/register.phtmllayout handle: <customer_account_create>Product GridLet's suppose that we want to set the main template for the default category view to one column; in this case, we have to insert the action setTemplate into the catalog_category_default handle in the following manner: <catalog_category_default> <reference name="root"> <action method="setTemplate"> <template>page/1column.phtml</template> </action> </reference> </catalog_category_default> If we want to set a different template, for example, two columns with the right-hand side sidebar for the layered categories, we will have to set the action in the other handle as follows: <catalog_category_layered> <reference name="root"> <action method="setTemplate"> <template>page/2columns-right.phtml</template> </action> </reference> </catalog_category_layered> Product Page:If you decide to set to 1 column, change the root template to the 1column template as given in the following code: <catalog_product_view> <reference name="root"> <action method="setTemplate"> <template>page/1column.phtml</template></action> </reference> </catalog_product_view>