4) .htaccess dosyasına şunları yazabilirsin.

ExpiresActive On
ExpiresByType image/gif "access plus 2 weeks"
ExpiresByType image/jpg "access plus 2 weeks"
ExpiresByType image/jpeg "access plus 2 weeks"
ExpiresByType image/png "access plus 2 weeks"
ExpiresByType image/bmp "access plus 2 weeks"
ExpiresByType text/css "access plus 2 weeks"
ExpiresByType application/javascript "access plus 2 weeks"
ExpiresByType application/x-javascript "access plus 2 weeks"
ExpiresByType text/javascript "access plus 2 weeks"