Sites that talk about hardening WordPress

http://www.forbes.com/sites/allbusiness/2014/03/24/how-to-secure-your-wordpress-website-from-hackers/

http://wpengine.com/blog/wordpress-security-best-practices-white-paper/

http://codex.wordpress.org/Hardening_WordPress

https://yoast.com/wordpress-security/

https://premium.wpmudev.org/blog/keeping-wordpress-secure-the-ultimate-guide/

http://www.woothemes.com/2013/09/improve-your-wordpress-security-with-these-10-tips/

 Sites that have plugins that will help with Security and Auditing.

https://wordpress.org/plugins/search.php?type=term&q=audit+log

https://wordpress.org/plugins/sucuri-scanner/

https://wordpress.org/plugins/wp-security-audit-log/

https://wordpress.org/plugins/audit-trail/