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The term you are searching is Get and Set URL params, you can use this to set a param in an URL, like this:

add_query_arg( 'key', 'value', 'http://example.com' );

it will return:

http://example.com?key=value

and to get the value use this:

<?php  $value_from_URL = get_query_var( 'key' );  ?>

<h1>My value i just got <?php echo $value_from_URL; ?></h1>

all of this using WordPress functions.