In addition of a previous comment where we added a new attribute to the customer  (https://www.offset101.com/magento-2-x-add-custom-attribute-customer-model-show-admin-panel/ ), here, we are going to add this attribute to the dashboard page of the customer.

At first, we need to know that all fields are rendered in the customer-module, so you will need to override the following file

to the corresponding one on your theme (or module).

Afterwards, and keeping the best Magento practice, we will need to override with a preference, the following Magento Block:

To do so, let’s perform the following steps, and create the following files:

• /Company/Custom/Block/Magento/Customer/Form/Edit.php
  
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  <?php   namespace Compony\Custom\Block\Magento\Customer\Form;   class Edit extends \Magento\Customer\Block\Form\Edit {     public function getCustomField()     {         return $this->customerSession->getCustomer()->getCustomField();     }   }

• /Company/Custom/etc/di.xml
  
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  <?xml version="1.0"?> <config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">     <preference for="Magento\Customer\Block\Form\Edit" type="Company\Custom\Block\Magento\Customer\Form\Edit" /> </config>

  
   

After adding it, you will be able to add your custom field, in the edit.phtml overrided before, with the following line of code:

Remember to clean cache, and do a setup upgrade.

Happy Coding!