How to redirect to another site file?

Question

PHP

All requests on the site are redirected to index.php . It was necessary that the page with registration/login opens not in index.php , but for example in login.php , in another subcategory... I roughly understand the logic of how it should be: check what request is in the address bar, and depending on whether there is such file to redirect this request to login.php. how to do this through .htaccess, I don’t understand the syntax, that’s why I asked for help?
the problem was solved by adding redirect exceptions

Answer 1

via htaccess