When you want to list posts or posts that have a specific category or tag (‘actors-movies‘) you use WP_Query to request it. At the bottom of my individual posts on each Actor, I list all their Movies. This query just checks to see if the current post is tagged ‘actors-movies’, and that it’s not on the homepage, and if it meets those criteria then it lists all of each Actors Movies.
I use this approach for many things. It can show the most recent posts in a widget or footer, or list specific posts on specific pages. You use this any time you want to call WordPress and not involve the main content (The “standard Loop”).
For information on all the parameters you can use, see WP_Query in the Codex.
For this example, I’m going to call all the posts tagged ‘actors-movies’ and put them in a list with the title linked to the post itself.
Make sure you include the wp_reset_query(), which will reset the query back to the default and should be called after “The Loop” to ensure conditional tags work as expected. If you don’t do this, WordPress will keep the last query and not delete them which will cause comments from the previous posts to be displayed.