How to disable directory listings
 

on my web server. Any how-to on it

Options -Indexes

in htaccess

Add in you htaccess file:

IndexIgnore *

or just make a

index.htm
or
index.html

put it in all your folders

or like above, with htaccess

Yep, set Options -Indexes.
When someone tries to hit your raw folder, they'll get a 401 error.
So you may also want to set an ErrorDocument for 401 errors and send them somewhere useful.