Sometimes, we may want to exclude some categories from display in our main page or sidebar. There are a lot of methods to exclude these categories. Here i would like to share 3 types of different method to do so.
Use WordPress Category Visibility Plugin
This plugin will let you to exclude any tag and category at different pages. For example, you can exclude selected category in the front page, search results, archives, and feeds. Simply activate the plugin and go to your Manage->Category Visibility to manage them. (There are some users who claim this plugin may has conflict with other WordPress plugins.)
wp_list_categories() template tags
You may use this template tags to list out all categories at your website’s navigation bar or your sidebar. The template tags tutorial website actually teach us how to include or exclude categories by adding parameters when we call this template tags.
Hack the default widgets.php