If you are designing WordPress themes and you want to keep it clean, you may want to exclude some categories in a page that may not be relevant, or too unnecessary to have that many categories in a page. If you think it is difficult, you are wrong because this is very easy to do. This article explains how you can exclude post categories in a blog page by editing your index.php (or whichever you use to edit your blog post), then adding a line of code right before the loop. You can also do advanced arguments in this lecture where you’ll only show categories on a specific time of the day.
Read full article here: http://www.cheesetoast.co.uk/exclude-include-category-wordpress-blog-page/