The correct way to do this is to make use of pre_get_posts which change the query vars just before the main query is executed. Here is an example from the codex to exclude categories from the home page/blog page. For a full list of available parameters and values that you can use with pre_get_posts, visit Full Article…
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Display tags related to category
Get tags related to one (or more) specific category? Taken from WP Receipes: http://www.wprecipes.com/wordpress-trick-function-to-get-tags-related-to-category First, here is the function you have to paste in your function.php file: Once you have pasted the function, you can use it in your theme: