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How to display all attributes of a product like default and custom attributes on a product view page at just right side to the product.

Note: I don't want to display at tab or anywhere.

Go to your theme's addtocart.phtml like below:

app/design/frontend/your_package/your_theme/Magento_Catalog/templates/product/view/addtocart.phtml

Then you can add your code for your custom attribute like below :

<?= $_product->getAttributeText('attribute_code'); ?> //For dropdown
<?= $_product->getData('attribute_code'); ?> //For text

Note: Write your custom code anywhere on this page but after the line <?php $_product = $block->getProduct(); ?>

I found the solution.

First create new file at this path :

magento/vendor/magento/module_catelog/view/frontend/templates/product/view/attributes_productpage.phtml

code:

<?php
/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */

// @codingStandardsIgnoreFile

/**
 * Product additional attributes template
 *
 * @var $block MagentoCatalogBlockProductViewAttributes
 */
?>
<?php
 $_helper = $this->helper('MagentoCatalogHelperOutput');
 $_product = $block->getProduct();
?>
<?php if ($_additional = $block->getAdditionalData()): ?>
 <div class="additional-attributes-wrapper table-wrapper">
 <table class="data table additional-attributes" id="product-attribute-specs-table1">
 <caption class="table-caption"><?= /* @escapeNotVerified */ __('More Information') ?></caption>
 <tbody>
 <?php foreach ($_additional as $_data): ?>
 <tr>
 <th class="col label" scope="row"><?= $block->escapeHtml(__($_data['label'])) ?></th>
 <td class="col data" data-th="<?= $block->escapeHtml(__($_data['label'])) ?>"><?= /* @escapeNotVerified */ $_helper->productAttribute($_product, $_data['value'], $_data['code']) ?></td>
 </tr>
 <?php endforeach; ?>
 </tbody>
 </table>
 </div>
<?php endif;?>

Go to your theme folder

magento/app/design/frontend//magento-catalog/catalog_product_view.xml

OR

magento/vendor/magento/module-catalog/view/frontend/layout/catalog_product_view.xml

file. Add these code to this file:

 <block class="MagentoCatalogBlockProductViewAttributes" name="product.attributes1" template="product/view/attributes_productpage.phtml" > 
 </block>

<move element="product.attributes1" destination="product.info.main" after="product.info.demo"/> 

Now flush all cache memory and data, Reload your product page.

For flush, run this command:

php bin/magento c:f

You can see this: