Security in WordPress is taken very seriously, but as with any other system there are potential security issues that may arise if some basic security precautions aren't taken. This course will go through some common forms of vulnerabilities, and the things you can do to help keep your WordPress installation secure.
This course is is the ultimate quick fix to your security concerns. If you have specific security concerns or doubts then this course will surely help you.
Fundamentally, security is not about perfectly secure systems. Such a thing might well be impractical, or impossible to find and/or maintain. A secure server protects the privacy, integrity, and availability of the resources under the server administrator's control.