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Get Product stock

<?php 
    $objectManager = \Magento\Framework\App\ObjectManager::getInstance();
    $StockState = $objectManager->get('\Magento\CatalogInventory\Api\StockStateInterface');
    echo $StockState->getStockQty($product->getId(), $product->getStore()->getWebsiteId());
?>

or

<?php
   $stockItem = $product->getExtensionAttributes()->getStockItem();
   print_r($stockItem->getQty()); 
?>