Is RewriteBase even necessary?

Question

PHP

Friends, realizing that banality - I dare to ask for help.
I spent half a day "playing" with this htaccess. As a result, it only worked when I deleted this Rewritebase ...
I beg you, not with documentation, but with a real answer to help ... A lot of time is spent transferring the site to hosting - it should not be like
this locales:

Options -MultiViews
RewriteEngine On

RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME} !-f

RewriteRule ^(.*)$ index.php?url=$1 [QSA,L]

There is an admin panel on the locale:

AuthType Basic
AuthName "Thats protected Area!"
AuthUserFile C:\xampp\htdocs\mysiteru\public\admin\.htpasswd
Require valid-user

Options -MultiViews
RewriteEngine On

RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^(.+)$ index.php?url=$1 [QSA,L]

Hosting Root:

Options -MultiViews
RewriteEngine On

RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME} !-f

RewriteRule ^(.*)$ index.php?url=$1 [QSA,L]

Hosting admin:

AuthType Basic
AuthName ' Admin'
AuthUserFile /home/u171101/mysiteru/www/admin/.htpasswd
Require valid-user

Options -MultiViews
RewriteEngine On

RewriteBase /admin/

RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME} !-f

RewriteRule ^(.*)$ /admin/index.php?url=$1 [QSA,L]

I'm really confused ... by typing everything ... and sometimes it works, then it throws errors ...
How should it be? I would be grateful ... In
total, there are 4 htaccess options:
1) root on the locale
2) admin panel on the locale
3) root on the hosting
4) admin panel on the hosting.

Answer 1

needed and very much so.
Example if /
without directive $1= /var/www/site/web/четотам
with directive $1= /
Wash profit is obvious
now by
AuthUserFile /home/u171101/mysiteru/www/admin/.htpasswd
OpenServer and use the Linux path.
If it's just so impatient, then create such a folder in the structure, and make it a link.
You will be happy