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You want Posts 2 Posts which allows you to create many to many (or one to many or many to one) relationships between post objects -- including custom post types. To related stores and deals you might …

If you just want to "turn off" the public facing part of a taxonomy (eg. just use it for grouping), you can do that when you register it. Just set the query_var argument to false and WordPress will n …

Hook into pre_get_posts, check for the taxonomy, and set all four post types as the post_type parameter of the query object. Check out the Type Parameters section on the WP_Query docs for more informa …

As the other's mentioned, wp_list_categories will work if you you want to do a list of things (just like wp_list_pages does for pages). If you specifically want the link (URL), you can use get_term_l …

I would not use query_posts and instead use post_class and a new WP_Query object. to insert the taxonomy slugs. This is more "future proof" and you can put it in a plugin to keep the same functionali …

You want to look into the_terms or its big brother get_the_terms. It's how you display custom taxonomies on the front end -- similar to the_category or the_tags. Example: <?php // somewhere in a tem …

So, first off, I would use get_posts instead of writing your own query. The strategy: fetch all the posts at once, then filter them using a callback or foreach loops. What follows is a PHP 5.3+ examp …

You can set your tag base differently in the admin area: Settings > Permalinks then at the bottom there is a field for "Tag Base". Enter "celebrities" in that field and your tag pages will be yoursit …

Okay, so first off, I would rename your video category to something like video_category so it doens't conflict with the built in category. That said, the easiest way I could think to demonstrate this …

WordPress let's you define where a post type appears in the args where you register it. It's the show_in_menu argument. You can set it to true, false or a the slug (a string) of the page under which …

I wouldn't try to localize your slugs. Instead, why not give your users the option to change them by adding another field to the permalink settings page? Hook into load-options-permalink.php and set …

I'd recommend you use a SEO plugin to take control of all of your titles. WordPress SEO by Yoast is very good. Or you could add a filter to wp_title to change the output. <?php add_filter( 'wp_tit …

Use get_the_terms. It will either return an empty array, a WP_Error object, or the terms. So you can check it they exist. <?php $terms = get_the_terms( $post->ID, 'promotion' ); if( $terms && ! is_ …

This is probably happening because the taxonomy you're trying to query is registered yet. Eg. The WordPress environment is loaded when a theme's functions.php file loads, but many plugins/themes/core …

Pretty much the same as the above to answers, but using meta_query instead of meta_key. meta_key was deprecated as of WP 3.1. I'm not sure if ordering by meta_value still works in this case, however. …