How to prescribe the redirection of certain requests using mod_rewrite?

Question

Apache HTTP Server

Good afternoon dear minds. Due to the fact that my knowledge in .htaccess is close to 0, I have to turn to you for help.
there is a project (I give the structure below)
/www
/folder_01
index.php
..htaccess
/folder_02
index.php
..htaccess
/folder_03
index.php
..htaccess
index.php
.htaccess
In the folder_01 folder there is a self-written script that works on the www principle .site.com/controller/action/
at the root of the /www directory in .htaccess the following is written

AddDefaultCharset utf-8
DirectoryIndex index.php
Options -Indexes

<IfModule mod_rewrite.c>
    RewriteEngine on
    RewriteBase /
    RewriteRule ^(.*)$ folder_01/index.php [QSA,L]
</IfModule>

and in .htaccess located in /folder_01 directory something like this

AddDefaultCharset utf-8

DirectoryIndex index.php
Options -Indexes

<IfModule mod_rewrite.c>
    RewriteEngine On
    RewriteBase /
    RewriteCond %{REQUEST_URI} !(.*)\.(css|js|png|jpg|gif|ico)
    RewriteRule ^(.*)$ index.php?_url=$1 [QSA,L]
</IfModule>

Now the question is how to convert this .htaccess file so that requests
www.site.com/controller/action/ fall into the folder /folder_01
www.site.com/folder_01/controller/action/ fall into the folder /folder_01
www.site.com/folder_02 /controller/action/ got into the folder /folder_02
www.site.com/folder_03/controller/action/ got into the folder /folder_03
folders sometimes scripts will be added or removed
in these folders are not known in advance it can be like wordpress or something then self-written
I will also be grateful for tips on the correct material for studying configuring .htaccess
Thank you all for your attention