Can you help me with that rules? I try to implememnt but i take a lot of mistakes and too many redirects, so i want little help with that.

Options +FollowSymLinks -MultiViews
        RewriteEngine On
        RewriteBase /

        ErrorDocument 404 https://follow.bgsources/not-found.php          
        RewriteCond %{REQUEST_METHOD} !POST
        RewriteCond %{THE_REQUEST} \s/+(.+?)\.php[\s?] [NC]
        RewriteRule ^ /%1 [R=302,NE,L]

        RewriteCond %{REQUEST_METHOD} !POST
        RewriteCond %{THE_REQUEST} /index\.php [NC]
        RewriteRule ^(.*)index\.php$ /$1 [L,R=302,NC,NE]

        RewriteCond %{REQUEST_FILENAME} -d [OR]
        RewriteCond %{REQUEST_FILENAME} -f
        RewriteRule ^ - [L]

        RewriteRule ^hashtag/([^/]+)/?$ hashtags.php?tag=$1 [L,QSA]
        RewriteRule ^settings/([\w-]+)/?$ settings.php?set=$1 [L,QSA]
        RewriteRule ^credit/([\w-]+)/?$ buyCredit.php?cr=$1 [L,QSA]
        RewriteRule ^status/([^/]+)/?$ status.php?msgID=$1 [L,QSA]
        RewriteRule ^chat/([\w-]+)/?$ chat.php?with=$1 [L,QSA]
        RewriteRule ^account/([\w-]+)/?$ sources/index.php?get=$1 [L,QSA]
        RewriteRule ^dashboard/([\w-]+)/?$ admin/index.php?set=$1 [L,QSA]
        RewriteRule ^profile/([^/]+)/?$ profile.php?username=$1 [L,QSA,NC]  
        RewriteRule ^profile/(followers|friends|saved|stories)/([^/]+)/?$ $1.php?username=$2 [L,QSA,NC]
        RewriteRule ^mymarket/([^/]+)/?$ market.php?marketid=$1 [L,QSA,NC]
        RewriteRule ^mymarket/(sold|about)/([^/]+)/?$ market.php?marketid=$2 [L,QSA,NC]
        RewriteRule ^event/([^/]+)/?$ event.php?eventID=$1 [L,QSA,NC] 
        RewriteRule ^events/([\w-]+)/?$ events.php?p=$1 [L,QSA,NC]    
        RewriteRule ^product/([^/]+)/?$ product.php?productid=$1 [L,QSA]  

        RewriteRule ^marketplace/(category)/([^/]+)/?$ marketplace.php?category=$2 [L,QSA,NC]
        RewriteRule ^marketplace/(search)/([^/]+)/?$ marketplace.php?sproduct=$2 [L,QSA,NC]


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

        <IfModule mod_headers.c>
        Header set Access-Control-Allow-Origin '*'
        </IfModule>