We can do it by using preference if we need to add or edit some information in createPost controller.

To do that we will need a module : Magemonkeys_General

We have need two files.

Create di.xml file in this folder app/code/Magemonkeys/General/etc/

<?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\Controller\Account\CreatePost" type="Magemonkeys\General\Controller\Magento\Customer\Account\CreatePost" />
</config>

<?xml version="1.0"?>

</config>

Create CreatePost.php in this folder app/code/Magemonkeys/General/Controller/Magento/Customer/Account/

<?php

namespace Magemonkeys\General\Controller\Magento\Customer\Account;
use Magento\Customer\Api\CustomerRepositoryInterface as CustomerRepository;
use Magento\Framework\App\Action\HttpPostActionInterface as HttpPostActionInterface;
use Magento\Customer\Model\Account\Redirect as AccountRedirect;
use Magento\Customer\Api\Data\AddressInterface;
use Magento\Framework\Api\DataObjectHelper;
use Magento\Framework\App\Action\Context;
use Magento\Customer\Model\Session;
use Magento\Framework\App\Config\ScopeConfigInterface;
use Magento\Framework\App\CsrfAwareActionInterface;
use Magento\Framework\App\ObjectManager;
use Magento\Framework\App\Request\InvalidRequestException;
use Magento\Framework\App\RequestInterface;
use Magento\Framework\Controller\Result\Redirect;
use Magento\Framework\Exception\LocalizedException;
use Magento\Framework\Phrase;
use Magento\Store\Model\StoreManagerInterface;
use Magento\Customer\Api\AccountManagementInterface;
use Magento\Customer\Helper\Address;
use Magento\Framework\UrlFactory;
use Magento\Customer\Model\Metadata\FormFactory;
use Magento\Newsletter\Model\SubscriberFactory;
use Magento\Customer\Api\Data\RegionInterfaceFactory;
use Magento\Customer\Api\Data\AddressInterfaceFactory;
use Magento\Customer\Api\Data\CustomerInterfaceFactory;
use Magento\Customer\Model\Url as CustomerUrl;
use Magento\Customer\Model\Registration;
use Magento\Framework\Escaper;
use Magento\Customer\Model\CustomerExtractor;
use Magento\Framework\Exception\StateException;
use Magento\Framework\Exception\InputException;
use Magento\Framework\Data\Form\FormKey\Validator;
use Magento\Customer\Controller\AbstractAccount;

class CreatePost extends \Magento\Customer\Controller\Account\CreatePost
{
	/**
     * @var Validator
     */
    private $formKeyValidator;
    protected $inlineTranslation;

    /**
     * @var \Magento\Framework\Stdlib\Cookie\PhpCookieManager
     */
    private $cookieMetadataManager;

    /**
     * @var \Magento\Framework\Stdlib\Cookie\CookieMetadataFactory
     */
    private $cookieMetadataFactory;

    public function __construct(
    	Context $context,
        Session $customerSession,
        ScopeConfigInterface $scopeConfig,
        StoreManagerInterface $storeManager,
        AccountManagementInterface $accountManagement,
        Address $addressHelper,
        UrlFactory $urlFactory,
        FormFactory $formFactory,
        SubscriberFactory $subscriberFactory,
        RegionInterfaceFactory $regionDataFactory,
        AddressInterfaceFactory $addressDataFactory,
        CustomerInterfaceFactory $customerDataFactory,
        CustomerUrl $customerUrl,
        Registration $registration,
        Escaper $escaper,
        CustomerExtractor $customerExtractor,
        DataObjectHelper $dataObjectHelper,
        AccountRedirect $accountRedirect,
        CustomerRepository $customerRepository,
        Validator $formKeyValidator = null
    ) {
    	$this->formKeyValidator = $formKeyValidator ?: ObjectManager::getInstance()->get(Validator::class);
        $this->accountRedirect = $accountRedirect;
    	return parent::__construct($context,$customerSession,$scopeConfig,$storeManager,$accountManagement,$addressHelper,$urlFactory,$formFactory,$subscriberFactory,$regionDataFactory,$addressDataFactory,$customerDataFactory,$customerUrl,$registration,$escaper,$customerExtractor,$dataObjectHelper,$accountRedirect,$customerRepository,$formKeyValidator);
    }

	public function execute()
    {          
        /** @var Redirect $resultRedirect */
        $resultRedirect = $this->resultRedirectFactory->create();
        if ($this->session->isLoggedIn() || !$this->registration->isAllowed()) {
            $resultRedirect->setPath('*/*/');
            return $resultRedirect;
        }

        // We can write our login here
    }
}

<?php

namespace Magemonkeys\General\Controller\Magento\Customer\Account;

use Magento\Customer\Api\CustomerRepositoryInterface as CustomerRepository;

use Magento\Framework\App\Action\HttpPostActionInterface as HttpPostActionInterface;

use Magento\Customer\Model\Account\Redirect as AccountRedirect;

use Magento\Customer\Api\Data\AddressInterface;

use Magento\Framework\Api\DataObjectHelper;

use Magento\Framework\App\Action\Context;

use Magento\Customer\Model\Session;

use Magento\Framework\App\Config\ScopeConfigInterface;

use Magento\Framework\App\CsrfAwareActionInterface;

use Magento\Framework\App\ObjectManager;

use Magento\Framework\App\Request\InvalidRequestException;

use Magento\Framework\App\RequestInterface;

use Magento\Framework\Controller\Result\Redirect;

use Magento\Framework\Exception\LocalizedException;

use Magento\Framework\Phrase;

use Magento\Store\Model\StoreManagerInterface;

use Magento\Customer\Api\AccountManagementInterface;

use Magento\Customer\Helper\Address;

use Magento\Framework\UrlFactory;

use Magento\Customer\Model\Metadata\FormFactory;

use Magento\Newsletter\Model\SubscriberFactory;

use Magento\Customer\Api\Data\RegionInterfaceFactory;

use Magento\Customer\Api\Data\AddressInterfaceFactory;

use Magento\Customer\Api\Data\CustomerInterfaceFactory;

use Magento\Customer\Model\Url as CustomerUrl;

use Magento\Customer\Model\Registration;

use Magento\Framework\Escaper;

use Magento\Customer\Model\CustomerExtractor;

use Magento\Framework\Exception\StateException;

use Magento\Framework\Exception\InputException;

use Magento\Framework\Data\Form\FormKey\Validator;

use Magento\Customer\Controller\AbstractAccount;

class CreatePost extends \Magento\Customer\Controller\Account\CreatePost

{

/**

* @var Validator

private $formKeyValidator;

protected $inlineTranslation;

/**

* @var \Magento\Framework\Stdlib\Cookie\PhpCookieManager

private $cookieMetadataManager;

/**

* @var \Magento\Framework\Stdlib\Cookie\CookieMetadataFactory

private $cookieMetadataFactory;

public function __construct(

Context $context,

Session $customerSession,

ScopeConfigInterface $scopeConfig,

StoreManagerInterface $storeManager,

AccountManagementInterface $accountManagement,

Address $addressHelper,

UrlFactory $urlFactory,

FormFactory $formFactory,

SubscriberFactory $subscriberFactory,

RegionInterfaceFactory $regionDataFactory,

AddressInterfaceFactory $addressDataFactory,

CustomerInterfaceFactory $customerDataFactory,

CustomerUrl $customerUrl,

Registration $registration,

Escaper $escaper,

CustomerExtractor $customerExtractor,

DataObjectHelper $dataObjectHelper,

AccountRedirect $accountRedirect,

CustomerRepository $customerRepository,

Validator $formKeyValidator = null

) {

$this->formKeyValidator = $formKeyValidator ?: ObjectManager::getInstance()->get(Validator::class);

$this->accountRedirect = $accountRedirect;

return parent::__construct($context,$customerSession,$scopeConfig,$storeManager,$accountManagement,$addressHelper,$urlFactory,$formFactory,$subscriberFactory,$regionDataFactory,$addressDataFactory,$customerDataFactory,$customerUrl,$registration,$escaper,$customerExtractor,$dataObjectHelper,$accountRedirect,$customerRepository,$formKeyValidator);

}

public function execute()

{

/** @var Redirect $resultRedirect */

$resultRedirect = $this->resultRedirectFactory->create();

if ($this->session->isLoggedIn() || !$this->registration->isAllowed()) {

$resultRedirect->setPath('*/*/');

return $resultRedirect;

}

// We can write our login here

}

we will also need to add private function in this file as we used execute method.

/**
     * Retrieve cookie manager
     *
     * @deprecated 100.1.0
     * @return \Magento\Framework\Stdlib\Cookie\PhpCookieManager
     */
    private function getCookieManager()
    {
        if (!$this->cookieMetadataManager) {
            $this->cookieMetadataManager = ObjectManager::getInstance()->get(
                \Magento\Framework\Stdlib\Cookie\PhpCookieManager::class
            );
        }
        return $this->cookieMetadataManager;
    }

/**

* Retrieve cookie manager

* @deprecated 100.1.0

* @return \Magento\Framework\Stdlib\Cookie\PhpCookieManager

private function getCookieManager()

{

if (!$this->cookieMetadataManager) {

$this->cookieMetadataManager = ObjectManager::getInstance()->get(

\Magento\Framework\Stdlib\Cookie\PhpCookieManager::class

);

}

return $this->cookieMetadataManager;

}

That’s it.

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