Wordpress security is one of the main concern when this platform is getting so much popularity. To accomplish that, one should take a simple step by creating a new admin ID and password and delete the default "admin". As the default admin name for wordpress is "admin" which is known to everyone and may help hackers to get into your dashboard. So delete the default admin after creating another one. Then the most important thing is to hide the admin name. To do that, never post an article with admin account otherwise your admin account will get exposed.
Create a new user with editor privilege and write post using that ID only. Get more details about this type of security on Internet Techies.