WordPress is a wonderfully powerful CMS that ships with many versatile features giving it the flexibility to work out of the box for a wide range of users. However, if you are a professional building custom themes and plugins, sometimes these features can be problematic.
The same features and options that allow off-the-shelf themes to adapt to many different use cases can sometimes also be used to undermine a carefully designed custom theme built for a specific use case. What is there to be done?
Yoast is a good PHP WordPress plug-in option for security and search engine optimization.
They also are very knowledgeable on the subject of WordPress security .