Expires headers tells the browser where a resource on the website needs to be requested from the source. It tell the browser that how long it should keep the cached files from the site. the benefits of the settings expires headers to control the browser caching. You can restrict it by period.
Just add this code in the .htaccess file.
# BEGIN Add Expires Headers Plugin <IfModule mod_expires.c> ExpiresActive on #image ExpiresByType image/gif A31104000 ExpiresByType image/ico A31104000 ExpiresByType image/jpeg A31104000 ExpiresByType image/jpg A31104000 ExpiresByType image/png A31104000 ExpiresByType image/tiff A31104000 ExpiresByType image/webp A31104000 #audio ExpiresByType audio/dct A31104000 ExpiresByType audio/gsm A31104000 ExpiresByType audio/mp3 A31104000 ExpiresByType audio/ogg A31104000 ExpiresByType audio/raw A31104000 ExpiresByType audio/vox A31104000 ExpiresByType audio/wav A31104000 #video ExpiresByType video/3gp A31104000 ExpiresByType video/avi A31104000 ExpiresByType video/flv A31104000 ExpiresByType video/mkv A31104000 ExpiresByType video/mp4 A31104000 ExpiresByType video/webm A31104000 ExpiresByType video/wmv A31104000 #font ExpiresByType font/otf A31104000 ExpiresByType font/ttf A31104000 ExpiresByType font/woff A31104000 ExpiresByType font/woff2 A31104000 #text ExpiresByType text/css A31104000 #application ExpiresByType application/js A31104000 ExpiresByType application/javascript A31104000 ExpiresByType application/x-javascript A31104000 </IfModule> # END Add Expires Headers Plugin First we activate the "expirations" . then we add the different lines for every file with expiration date, it will work and you will returned back good result in SEO.