How can PHP beginners determine the appropriate sections of their website to integrate captchas for optimal security without compromising user experience?

To determine the appropriate sections of a website to integrate captchas for optimal security without compromising user experience, PHP beginners can identify high-risk areas such as login forms, registration pages, and contact forms where bots are likely to submit spam or malicious content. By implementing captchas in these sections, users can be protected from automated attacks while still providing a seamless experience for legitimate users. 

// Example PHP code snippet to integrate Google reCAPTCHA in a registration form

<form action="submit.php" method="post">
    <input type="text" name="username" placeholder="Username">
    <input type="password" name="password" placeholder="Password">
    
    <!-- Google reCAPTCHA -->
    <div class="g-recaptcha" data-sitekey="your_site_key_here"></div>
    
    <button type="submit">Register</button>
</form>

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