How to Add Google reCAPTCHA to the Magento 2 custom form?

Method to Add Google reCAPTCHA to Magento 2:

• Add script to any head or where you want to use google Recaptcha
  <script src=”https://www.google.com/recaptcha/api.js” type=”text/javascript” xml=”space”></script>
• Add captcha code to phtml or block/page where you want to add v2 google Recaptcha in the form

• If the captcha does not validate then add the below code:
  

• In any form add onSubmit() event like:
  <form class=”contact-form” name=”contactForm” id=”contactForm” action=”<?php echo $block->getFormAction(); ?>” method=”post” data-hasrequired=”<?php echo __(‘* Required Fields’) ?>” data-mage-init='{“validation”:{}}’ onSubmit=”return checkCaptcha();”>