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Working out with blocks and layouts in magento 2

Page layout declares the wireframe of a page inside the <body> section, for example one-column layout or two-column layout.
The allowed layout instructions are:

 <container>
 <referenceContainer>
 <move>
 <update>

If we want to include a additional template file in home page, we can do it by adding the following layout update at cms design layout update section at admin.

<referenceContainer name="footer">
    <block class="Magento\Framework\View\Element\Template" name="nameofblock" template="Magento_Theme::template_name.phtml"/>
</referenceContainer>

Here we are including "template_name.phtml" at footer container section.
The phtml template file should be under the templates folder of the module of our theme. Here the template is inside the module "Magento_Theme" under our theme.



If we want to include the template from static blocks section at admin, add the following block at the static block content.

{{block class="Magento\Framework\View\Element\Template" name="nameofblock" template="Magento_Theme::template_name.phtml"}}

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