Earlier we discussed about a free WordPress plugin which lets you Customize WordPress With 20+ Hacks Easily From Your Admin Area Dashboard. This tutorial explains you adding some advanced setting options that are not provided by default in WordPress.
It is possible to show-hide categories based on your WordPress site user roles. The CaPa Protect is a free WordPress plugin lets allows you to hide or display categories based on user roles types like Editor, Author, Contributor etc. The plugin also provides you the feature of showing a message whenever a someone arrives without permission on a protected blog post of your website. Also you can simply hide everything and your user will not be able to know the existence of hidden post.