app/code/Foo/Bar/view/frontend/templates/baz.phtml
<!-- A standard PHTML template that contains the info you wish to display. -->
<p><?= __('This is a description') ?></p>
app/code/Foo/Bar/view/frontend/layout/cms_index_index.xml
<?xml version="1.0"?>
<!--
The file cms_index_index.xml targets {routeId}_{controllerName}_{actionName}.
In this case, the routeId is "cms" and will target the index controller and
action. This will make this layout XML file only apply to the home page.
-->
<page xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:View/Layout/etc/page_configuration.xsd">
<body>
<!--
Create a "referenceContainer" node, using the name of the container or
block you wish to place your template within.
-->
<referenceContainer name="content">
<!--
Create a new "block" child node. The "name" is any arbitrary name,
usually delineated with periods or underscores. The "template"
attribute expects the string syntax of a module, in the format
"VendorName_ModuleName::template-name.phtml".
The location after the double colons resolves to
view/frontend/templates of the main module directory. For example,
the following code resolves to look for a file at the location:
app/code/Foo/Bar/view/frontend/templates/baz.phtml
-->
<block name="foo.bar" template="Foo_Bar::baz.phtml"/>
</referenceContainer>
</body>
</page>
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