Generating Google reCAPTCHA keys
Go to Google reCAPTCHA ➝ v3 Admin Console ➝ click the Create icon ➝ fill in Label ➝ fill in Domains ➝ click the Submit button.
Enabling Google reCAPTCHA plugin in Joomla
Joomla admin ➝ Site ➝ Plugins ➝ find, open, and enable Captcha - ReCaptcha ➝ select ReCaptcha version 2.0 ➝ enter the Site Key and Secret Key.
Enabling Google reCAPTCHA in forms
Open your form ➝ Submit Button Settings ➝ Spam Protection ➝ in the reCAPTCHA field, select CAPTCHA - reCAPTCHA.