Hello Friends!
In this blog, we are going to learn how we can display a custom block in the cart summary section on the shopping cart page at the front end.
Want to know more about customizing your shopping cart page, here are a few links:
How to add more product information on checkout cart in magento2
Display custom price fee on checkout cart and summary total in magento2
How to show additional data on Mini-cart in Magento 2
Display custom block on the checkout cart page in Magento 2
In Magento 2, sometimes we need to display some additional information in the cart summary section in our custom module. Then we can achieve the same by following steps:
1. Create checkout_cart_index.xml file inside the app/code/Vendor/CustomModule/view/frontend/layout/ directory.
<?xml version="1.0"?>
<!-- /**
* Vendor Desc.
*
* @category Vendor
* @package Vendor_CustomModule
* @author Vendor
* @copyright Copyright (c) Vendor
* @license https://example.com/license.html
*/ -->
<page xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:View/Layout/etc/page_configuration.xsd">
<body>
<referenceContainer name="checkout.cart.totals.container">
<block class="Magento\Framework\View\Element\Template"
name="checkout.cart.custom.block"
after="checkout.cart.totals"
template="Vendor_CustomModule::customblock.phtml" />
</referenceContainer>
</body>
</page>2. Create the customblock.phtml file inside the app/code/Vendor/CustomModule/view/frontend/templates/ directory.
<p style="color:green;">
Custom Block<br/>
Write your content Here...
</p>3. See the result in the following image:
4. If you want to display the custom block before the cart totals section, then use ‘before=”checkout.cart.totals” ‘ in place of ‘after=”checkout.cart.totals” ‘. And the result will be as the following image:
Hope this will be helpful. Thanks 
