There's bad people out there, people who will try and takeover your site. You need something to protect you, to keep the bad guys at bay. That's where Wordfence steps in...
https://en-gb.wordpress.org/plugins/wordfence/
Wordfence features a firewall and malware scanner to protect your WordPresssite . Wordfence uses with the newest firewall rules, malware signatures and malicious IP addresses it to keep your website safe. You can also utilise Wordfence to limit login attempts as well as enforcing strong passwords.
Other plugins are available, checkout iTheme Security, Securi Security or Shield Security...
Posted from webomattic.co.uk with SteemPress : http://webomattic.co.uk/wordpress-tip-6-build-a-wall/