.htaccess Subroto

NB: Any Rule start with "RewriteRule ^"  + Type url in browser  +  PHP file need to load
# .htaccess to get the value from url ie. edeves.com/myValue
RewriteEngine On
RewriteRule ^([a-zA-Z0-9]+)$ index.php?id=$1

# index.php
<?php
if(isset($_GET["id"])){
	if($_GET["id"]!="") {
		echo "User ID: " . $_GET["id"];  // User ID: myValue
        var_dump($_GET);
	} else {
		echo "index.php";
        var_dump($_GET);
	}
    
} else {
    echo "None";
}

# Url will be same but script load from a.php; edeves.com/myValue
RewriteEngine On
RewriteRule ^$ index.php?id=$1
RewriteRule ^([a-zA-Z0-9]+)$ a.php?id=$1   // script load from here not index.php

# Redirect
RewriteRule ^tracking/([a-zA-Z0-9]+)$ tracking_link_en.php?code=$1 [QSA,L]   // edeves.com/tracking/23424  --> tracking_link_en.php?23424
RewriteRule ^subtest/$ subtest/index.php?code=$1 [QSA,L]  // edeves.com/subtest --> index.php 
RewriteRule ^subtest/([a-zA-Z0-9]+)$ subtest/index.php?code=$1 [QSA,L]  // https://prnt.sc/mpJGGOsaf-Qz

https://www.brontobytes.com/knowledgebase/149/.htaccess-RewriteRule-Examples.html?language=english&currency=7