How to configure .htaccess for routing correctly?

Question

htaccess

I've been trying to set up .htaccess correctly for several days, but I just can't get what I want.
If the user enters:
www.site.com redirect to site.com
www.site.com redirect to site.com
site.com/article redirect to site.com/article/
There is also a problem if the user enters site.com/index.php /article also works like site.com/article

RewriteEngine on
RewriteBase /

RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule (.*) /index.php?$1 [QSA,L]

Answer 1

these are the simplest redirects. examples - a cloud.

Answer 2

.htaccess
RewriteEngine on
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ index.php?url=$1 [L,QSA]
PHP Routing Library