Magento 2 - Redirect customer to custom page after login

A plugin is a better solution in this case because your extended class might need to be updated when Magento 2 updates.

Here is a solution using a after-plugin on LoginPost->execute() as suggested by Xenocide8998.

/Vendor/Module/etc/frontend/di.xml:

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">
  <type name="\Magento\Customer\Controller\Account\LoginPost">
    <plugin name="vendor_module_loginpostplugin" type="\Vendor\Module\Plugin\LoginPostPlugin" sortOrder="1" />
  </type>
</config>

/Vendor/Module/Plugin/LoginPostPlugin.php:

<?php

/**
 *
 */
namespace Vendor\Module\Plugin;

/**
 *
 */
class LoginPostPlugin
{

    /**
     * Change redirect after login to home instead of dashboard.
     *
     * @param \Magento\Customer\Controller\Account\LoginPost $subject
     * @param \Magento\Framework\Controller\Result\Redirect $result
     */
    public function afterExecute(
        \Magento\Customer\Controller\Account\LoginPost $subject,
        $result)
    {
        $result->setPath('/'); // Change this to what you want
        return $result;
    }

}

I resolved it by overriding the LoginPost class

etc/di.xml

<preference for="Magento\Customer\Controller\Account\LoginPost" type="Vendor\Module\Controller\Account\LoginPost" />

Vendor/Module/Controller/Account/LoginPost.php

<?php

namespace Vendor\Module\Controller\Account;

use Magento\Customer\Model\Account\Redirect as AccountRedirect;
use Magento\Framework\App\Action\Context;
use Magento\Customer\Model\Session;
use Magento\Customer\Api\AccountManagementInterface;
use Magento\Customer\Model\Url as CustomerUrl;
use Magento\Framework\Exception\EmailNotConfirmedException;
use Magento\Framework\Exception\AuthenticationException;
use Magento\Framework\Data\Form\FormKey\Validator;

/**
 * @SuppressWarnings(PHPMD.CouplingBetweenObjects)
 */
class LoginPost extends \Magento\Customer\Controller\Account\LoginPost {

    public function execute() {
        if ($this->session->isLoggedIn() || !$this->formKeyValidator->validate($this->getRequest())) {
            /** @var \Magento\Framework\Controller\Result\Redirect $resultRedirect */
            $resultRedirect = $this->resultRedirectFactory->create();
            $resultRedirect->setPath('home');
            return $resultRedirect;
        }

        if ($this->getRequest()->isPost()) {
            $login = $this->getRequest()->getPost('login');
            if (!empty($login['username']) && !empty($login['password'])) {
                try {
                    $customer = $this->customerAccountManagement->authenticate($login['username'], $login['password']);
                    $this->session->setCustomerDataAsLoggedIn($customer);
                    $this->session->regenerateId();
                } catch (EmailNotConfirmedException $e) {
                    $value = $this->customerUrl->getEmailConfirmationUrl($login['username']);
                    $message = __(
                            'This account is not confirmed.' .
                            ' <a href="%1">Click here</a> to resend confirmation email.', $value
                    );
                    $this->messageManager->addError($message);
                    $this->session->setUsername($login['username']);
                } catch (AuthenticationException $e) {
                    $message = __('Invalid login or password.');
                    $this->messageManager->addError($message);
                    $this->session->setUsername($login['username']);
                } catch (\Exception $e) {
                    $this->messageManager->addError(__('Invalid login or password.'));
                }
            } else {
                $this->messageManager->addError(__('A login and a password are required.'));
            }
        }

        $resultRedirect = $this->resultRedirectFactory->create();
        $resultRedirect->setPath('home');
        return $resultRedirect;
    }

}