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I am update OG tag for home page,
app\design\frontend\Zero\mytheme\Magento_Theme\layout\default_head_blocks.xml
<meta property="og:image" content="http://example.com/DEFAULTIMAGE.png" />
<meta name="og:title" content="Printing coop is a most famous Digital Printing certer"/>
<meta name="og:description" content="Printing coop is a most famous Digital Printing certer in Montreal Canada.Professional Printer Services."/>
How to apply for my Category, Products, and CMS Pages & blocks?
For instance take a look for Product OG in .../vendor/magento/module-catalog/view/frontend/layout/catalog_product_opengraph.xml
You will find this :
<?xml version="1.0"?>
<!--
/**
* Copyright © Magento, Inc. All rights reserved.
* See COPYING.txt for license details.
*/
-->
<page xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:View/Layout/etc/page_configuration.xsd">
<head>
<attribute name="prefix" value="og: http://ogp.me/ns# fb: http://ogp.me/ns/fb# product: http://ogp.me/ns/product#" />
</head>
<body>
<referenceBlock name="head.additional">
<block class="Magento\Catalog\Block\Product\View" name="opengraph.general" template="Magento_Catalog::product/view/opengraph/general.phtml">
<block class="Magento\Directory\Block\Currency" name="opengraph.currency" as="meta.currency" template="Magento_Catalog::product/view/opengraph/currency.phtml"/>
</block>
</referenceBlock>
</body>
</page>
You can overwrite this template Magento_Catalog::product/view/opengraph/general.phtml in your theme
Template:
<?php
/**
* Copyright © Magento, Inc. All rights reserved.
* See COPYING.txt for license details.
*/
/** @var $block \Magento\Catalog\Block\Product\View */
?>
<meta property="og:type" content="product" />
<meta property="og:title"
content="<?= /* @noEscape */ $block->stripTags($block->getProduct()->getName()) ?>" />
<meta property="og:image"
content="<?= $block->escapeUrl($block->getImage($block->getProduct(), 'product_base_image')->getImageUrl()) ?>" />
<meta property="og:description"
content="<?= /* @noEscape */ $block->stripTags($block->getProduct()->getShortDescription()) ?>" />
<meta property="og:url" content="<?= $block->escapeUrl($block->getProduct()->getProductUrl()) ?>" />
<?php if ($priceAmount = $block->getProduct()->getPriceInfo()->getPrice(\Magento\Catalog\Pricing\Price\FinalPrice::PRICE_CODE)->getAmount()) :?>
<meta property="product:price:amount" content="<?= $block->escapeHtmlAttr($priceAmount) ?>"/>
<?= $block->getChildHtml('meta.currency') ?>
<?php endif;?>
And for Categories etc.. you can use the product as an example you can add a template to head.additional block
app/design/frontend/Zero_theme/my_theme/Magento_Catalog/templates/product/view/opengraph/general.phtml
Feb 8, 2021 at 12:25