We’ll use the WordPress hook pre_get_posts to modify the query settings before the main query runs. You must your function in your theme’s functions.php or a core functionality plugin. WordPress needs to build the query to figure out what template to load, so if you put this in a template file like archive.php it will be too late.
All our functions are going to have a similar structure. First we’re going to make sure we’re accessing the main query. If we don’t check this first our code will affect every query from nav menus to recent comments widgets. We’ll do this by checking $query->is_main_query().
We’ll also this code isn’t running on admin queries. You might want to exclude a category from the blog for your visitors, but you still want to access those posts in the Posts section of the backend. To do this, we’ll add ! is_admin().
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