Create a custom admin grid collection class to add a custom field to the grid

Collection.php

<?php

// 3. Create a custom collection class that extends SearchResult.

declare(strict_types=1);

namespace Macademy\Minerva\Model\ResourceModel\Faq\Grid;

use Magento\Framework\View\Element\UiComponent\DataProvider\SearchResult;

class Collection extends SearchResult
{
    protected function _construct(): void
    {
        $this->_init(
            'Macademy\Minerva\Model\Faq',
            'Macademy\Minerva\Model\ResourceModel\Faq'
        );
    }

    protected function _initSelect()
    {
        parent::_initSelect();

        // 4. Replace the following line with your custom EAV field/logic.
        $this->addFieldToSelect('myfield');

        return $this;
    }
}

di.xml.diff

 <?xml version="1.0"?>
 <config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">
+    <!-- 1. Replace the virtualType node with a "type" node, that specifies your new, real collection class.
+    
-    <virtualType name="Macademy\Minerva\Model\ResourceModel\Faq\Grid\Collection" type="Magento\Framework\View\Element\UiComponent\DataProvider\SearchResult">
+    <type name="Macademy\Minerva\Model\ResourceModel\Faq\Grid\Collection">
         <arguments>
             <argument name="mainTable" xsi:type="string">macademy_minerva_faq</argument>
             <argument name="resourceModel" xsi:type="string">Macademy\Minerva\Model\ResourceModel\Faq</argument>
         </arguments>
-    </virtualType>
+    </type>
     <type name="Magento\Framework\View\Element\UiComponent\DataProvider\CollectionFactory">
         <arguments>
             <argument name="collections" xsi:type="array">

macademy_minerva_faq_listing.xml.diff

                 <label translate="true">Question</label>
             </settings>
         </column>
+        <!-- 2. Add the name and label for your new custom field. -->
+        
+        <column name="myfield">
+            <settings>
+                <label translate="true">My Field</label>
+            </settings>
+        </column>
     </columns>
 </listing>