How to get value of a selected option from select tag and use it in WP_query to filter posts?

I assume you have posts with custom fields that have your select fields values as values for these custom fields, in this case you should take a closer look in ‘Custom Fields Paramenters’ from the WP_Query class references at: https://codex.wordpress.org/Class_Reference/WP_Query#Custom_Field_Parameters doing so you can just compare you select fields values with your post custom fields using the several relations possibles. Hope it helps.

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