1. Keep your WordPress software and plugins up to date: Regularly update your WordPress software and plugins to ensure that you have the latest security patches and fixes.

2. Use a strong and unique password: Use a strong and unique password for your WordPress admin account, and encourage your users to do the same.

3. Use a security plugin: Use a security plugin such as Wordfence or Sucuri to add an extra layer of security to your site. These plugins can help prevent brute force attacks, block malicious IPs, and scan your site for malware.

4. Use a web application firewall (WAF): A WAF (web application firewall) can help protect your site from common web attacks such as SQL injection and cross-site scripting.

5. Limit login attempts: Limit the number of login attempts that can be made on your site to prevent brute force attacks. You can use a plugin like Login Lockdown to do this.

6. Use SSL certificate: Use an SSL certificate to encrypt the data transmitted between your website and the visitors' browser, this will help protect sensitive information such as login credentials and credit card information.

7. Regularly backup your website: Regularly backup your website so that you can restore it in case of an attack or a problem.

8. Monitor your website: Regularly monitoring your website for unusual activity, such as new users or changes to content, can help you detect and respond to a security breach quickly.

It's important to note that security is an ongoing process, even if you take all these steps, you should always keep an eye on your website and update any new security measures as soon as they become available.