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I need to change my .htaccess and there are two lines which I don't understand.

RewriteCond %REQUEST_FILENAME !-l

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

When I should use these lines ?

Not the place to give a complete tutorial, but here it is in short;

RewriteCond basically means "execute the next RewriteRule only if this is true". The !-l path is the condition that the request is not for a link (! means not, -l means link)

The RewriteRule basically means that if the request is done that matches ^(.+)$ (matches any URL except the server root), it will be rewritten as index.php?url=$1 which means a request for ollewill be rewritten as index.php?url=olle).

QSA means that if there's a query string passed with the original URL, it will be appended to the rewrite (olle?p=1 will be rewritten as index.php?url=olle&p=1.

L means if the rule matches, don't process any more RewriteRules below this one.

For more complete info on this, follow the links above. The rewrite support can be a bit hard to grasp, but there are quite a few examples on stackoverflow to learn from.

If the following conditions are true, then rewrite the URL:

If the requested filename is not a directory,

RewriteCond %REQUEST_FILENAME !-d

and if the requested filename is not a regular file that exists,

RewriteCond %REQUEST_FILENAME !-f

and if the requested filename is not a symbolic link,

RewriteCond %REQUEST_FILENAME !-l

then rewrite the URL in the following way:

Take the whole request filename and provide it as the value of a "url" query parameter to index.php. Append any query string from the original URL as further query parameters (QSA), and stop processing this .htaccess file (L).

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

This will capture requests for files like version,
release, and README.md, etc. which should be
treated either as endpoints, if defined (as in the
case of /release), or as "not found."