You can prevent spam comments by enabling comment moderation in WordPress, using CAPTCHA or reCAPTCHA, limiting comment privileges to registered users, and installing anti-spam plugins like Akismet or Antispam Bee.

Some of the best anti-spam plugins for WordPress include Akismet Anti-Spam, Antispam Bee, WP Armour, CleanTalk, and Spam Protection by Titan. These plugins help filter and block spam comments, form submissions, and fake user registrations.

To stop spam user registrations, you can disable user registration if unnecessary (Settings > General > Uncheck “Anyone can register”), enable email confirmation or admin approval, add CAPTCHA to registration forms, and use plugins like Stop Spammers Security or WPBruiser.

You can reduce spam through contact forms by using plugins that offer built-in spam protection (e.g., Fluent Forms, WPForms, Contact Form 7 with reCAPTCHA), enabling honeypot fields, requiring email verification, and blocking suspicious IPs.