When I post the link of my site on facebook, the image added was 2 images, logo and other one. Facebook displayed the first ones. So I needed to add in default_head_block.xml file (app/design/frontend/Venustheme/kasitoo/Magento_Theme/layout)
the following code:
<meta property="og:type" content="website" />
<meta property="og:title" content="Sitename" />
<meta property="og:description" content="description site lorem ipsum" />
<meta property="og:url" content="http://sitename.ro/" />
<meta property="og:site_name" content="MyOrganic" />
<meta property="og:image" content="http://sitename/pub/media/facebook.jpg" />
The problem is that this overrides the meta open graphs from single product page. That are located in
general.phtml in vendor/magento/module-catalog/view/frontend/templates/product/view/opengraph
<meta property="og:type" content="og:product" />
<meta property="og:title" content="<?php echo $block->escapeHtml($block->getProduct()->getName()); ?>" />
<meta property="og:image" content="<?php echo $block->escapeUrl($block->getImage($block->getProduct(), 'product_base_image')->getImageUrl()); ?>" />
<meta property="og:description" content="<?php echo $block->escapeHtml($block->getProduct()->getShortDescription()); ?>" />
<meta property="og:url" content="<?php echo $block->escapeUrl($block->getProduct()->getProductUrl()); ?>" />
<?php if ($priceAmount = $block->getProduct()->getFinalPrice()):?>
<meta property="product:price:amount" content="<?php /* @escapeNotVerified */ echo $priceAmount; ?>"/>
<?php echo $block->getChildHtml('meta.currency'); ?>
<?php endif;?>
Where should I add the metas for homepage, in order to work properly the metas for single product pages??