Initial release

Setup/Patch/Data/bottomdesciptionAttribute.php

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+<?php
+/**
+ * Copyright &copy; LotsofPixels.io, Inc. All rights reserved.
+ */
+
+declare(strict_types=1);
+
+namespace LotsofPixels\CategoryBottomText\Setup\Patch\Data;
+
+use Magento\Eav\Model\Entity\Attribute\ScopedAttributeInterface;
+use Magento\Eav\Setup\EavSetup;
+use Magento\Eav\Setup\EavSetupFactory;
+use Magento\Framework\Setup\ModuleDataSetupInterface;
+use Magento\Framework\Setup\Patch\DataPatchInterface;
+use Magento\Catalog\Model\Category;
+
+/**
+ *
+ */
+class bottomdesciptionAttribute implements DataPatchInterface {
+
+    /**
+     * @var ModuleDataSetupInterface
+     */
+    private $moduleDataSetup;
+
+    /**
+     * @var EavSetupFactory
+     */
+    private $eavSetupFactory;
+    /**
+     * @param ModuleDataSetupInterface $moduleDataSetup
+     * @param EavSetupFactory          $eavSetupFactory
+     */
+    public function __construct(
+        ModuleDataSetupInterface $moduleDataSetup,
+        EavSetupFactory $eavSetupFactory
+    ) {
+        $this->moduleDataSetup = $moduleDataSetup;
+        $this->eavSetupFactory = $eavSetupFactory;
+    }
+
+    /**
+     * @return void
+     * @throws \Magento\Framework\Exception\LocalizedException
+     * @throws \Magento\Framework\Validator\ValidateException
+     */
+    public function apply() {
+        /** @var EavSetup $eavSetup */
+        $eavSetup = $this->eavSetupFactory->create(['setup' => $this->moduleDataSetup]);
+        $eavSetup->addAttribute(Category::ENTITY, 'bottom_description', [
+            'type' => 'text',
+            'label' => 'Description',
+            'input' => 'textarea',
+            'required' => false,
+            'sort_order' => 4,
+            'global' => ScopedAttributeInterface::SCOPE_STORE,
+            'wysiwyg_enabled' => true,
+            'is_html_allowed_on_front' => true,
+            'group' => 'General Information',
+        ]);
+    }
+
+    /**
+     * @return array|string[]
+     */
+    public static function getDependencies()
+    {
+        return [];
+    }
+
+    /**
+     * @return void
+     */
+    public function revert()
+    {
+    }
+
+    /**
+     * @return array|string[]
+     */
+    public function getAliases()
+    {
+        return [];
+    }
+}

composer.json

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+{
+  "name": "lotsofpixels/module-categorybottomtext",
+  "version": "1.0.0",
+  "description": "Adds a text field at the bottom of the category pagen for SEO purposes",
+  "type": "magento2-module",
+  "require": {
+    "magento/framework": "*"
+  },
+  "license": [
+    "Proprietary"
+  ],
+  "autoload": {
+    "files": [
+      "registration.php"
+    ],
+    "psr-4": {
+      "Lotsofpixels\\CategoryBottomText\\": ""
+    }
+  },
+    "author": "Rene Donkers",
+    "createAt": "01-10-2023",
+    "homepage": "Lotsofpixels.io"
+
+}

etc/module.xml

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+<?xml version="1.0"?>
+<!--
+/**
+ * Copyright &copy; LotsofPixels.io, Inc. All rights reserved.
+ */
+-->
+<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+        xsi:noNamespaceSchemaLocation="urn:magento:framework:Module/etc/module.xsd">
+    <module name="Lotsofpixels_CategoryBottomText"/>
+</config>

registration.php

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+<?php
+
+use Magento\Framework\Component\ComponentRegistrar;
+
+ComponentRegistrar::register(ComponentRegistrar::MODULE, 'Lotsofpixels_CategoryBottomText', __DIR__);

view/adminhtml/ui_component/category_form.xml

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+<?xml version="1.0" ?>
+<!--
+/**
+ * Copyright &copy; LotsofPixels.io, Inc. All rights reserved.
+ */
+-->
+<form xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:module:Magento_Ui:etc/ui_configuration.xsd">
+    <fieldset name="content">
+        <field name="bottom_description" template="ui/form/field" sortOrder="60" formElement="wysiwyg">
+            <argument name="data" xsi:type="array">
+                <item name="config" xsi:type="array">
+                    <item name="wysiwygConfigData" xsi:type="array">
+                        <item name="height" xsi:type="string">100px</item>
+                        <item name="add_variables" xsi:type="boolean">false</item>
+                        <item name="add_widgets" xsi:type="boolean">false</item>
+                        <item name="add_images" xsi:type="boolean">true</item>
+                        <item name="add_directives" xsi:type="boolean">true</item>
+                    </item>
+                    <item name="source" xsi:type="string">category</item>
+                </item>
+            </argument>
+            <settings>
+                <label translate="true">Bottom Description</label>
+                <dataScope>bottom_description</dataScope>
+            </settings>
+            <formElements>
+                <wysiwyg class="Magento\Catalog\Ui\Component\Category\Form\Element\Wysiwyg">
+                    <settings>
+                        <rows>8</rows>
+                        <wysiwyg>true</wysiwyg>
+                    </settings>
+                </wysiwyg>
+            </formElements>
+        </field>
+    </fieldset>
+</form>

view/frontend/layout/catalog_category_view.xml

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+<?xml version="1.0"?>
+<!--
+/**
+ * Copyright &copy; LotsofPixels.io, Inc. All rights reserved.
+ */
+-->
+<page xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" layout="2columns-left" xsi:noNamespaceSchemaLocation="urn:magento:framework:View/Layout/etc/page_configuration.xsd">
+    <body>
+        <referenceContainer name="content">
+            <block class="Magento\Catalog\Block\Category\View" name="bottom.description" template="Lotsofpixels_CategoryBottomText::product/list/bottom_description.phtml" after="-" />
+        </referenceContainer>
+    </body>
+</page>

view/frontend/templates/product/list/bottom_description.phtml

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+<?php
+/* @var Magento\Catalog\Block\Category\View $block */
+/* Copyright &copy; LotsofPixels.io, Inc. All rights reserved. */
+?>
+<?php if ($_bottomDescription = $block->getCurrentCategory()->getBottomDescription()): ?>
+    <div class="category-bottom-description">
+        <?= /* @escapeNotVerified */ $this->helper('Magento\Catalog\Helper\Output')->categoryAttribute($block->getCurrentCategory(), $_bottomDescription, 'bottom_description') ?>
+    </div>
+<?php endif; ?>