Removing .php with . Htaccess removes my entire webpage?

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htaccess

Hey i have been tryin this for a few days and I dont understand why this doesn't work?

.htaccess file

ReWriteEngine On

RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME}\.php -f
RewriteRule ^(.*)$ $1.php [NC, L]

I want to remove the .php from my urls but this results in a 404 page not found for all my files. i can't even find my project in localhost anymore??

What I have tried:

I have tried many tutorials but I'm doing exactly what they are doing ??
the closest I have gotten to my solution is

RewriteEngine On
RewriteBase /
RewriteCond %{THE_REQUEST} ^[A-Z]{3,}\s([^.]+)\.php [NC]
RewriteRule ^ %1 [R=301,L]
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME}.php -f
RewriteRule ^(.*?)/?$ $1.php [NC,L]

but now I can't go to other pages