Hi @leyzaola
Have you read this tutorial: https://www.advancedcustomfields.com/resources/query-posts-custom-fields/? Please read it carefully to learn how to query posts based on custom fields.
The value depends on how you get the input from the visitors. If you want, you can use URL parameters and get the value by using the $_GET variable. This page should give you more idea about it: http://php.net/manual/en/reserved.variables.get.php. There’s a tutorial how to filter posts on the archive page, but I believe you can do it on any other pages too. Please take a look at this page to learn more about it: https://www.advancedcustomfields.com/resources/creating-wp-archive-custom-field-filter/.
I hope this helps 🙂
