Exclude posts of specific category
You can hide posts of a specific category at your page template by applying the following code snippet:
$category = get_category_by_slug('my_hidden_cat_slug');
$cat_ID = $category->term_id;
$exclude_cat = '-' . $cat_ID;
$showposts = get_option('posts_per_page');
$catquery = new WP_Query("category_name={$post_categ}&posts_per_page={$showposts}&paged={$paged}&cat={$exclude_cat}");
