Browser Caching helps you ask your browser not to reload static files, such as CSS, image, etc. This improves the speed from the user's browser, giving better website access speed.
For optimization, simply add the following paragraph to the .htaccess file on the root directory.
Code:
## LEVERAGE BROWSER CACHING ##
<IfModule mod_expires.c>
ExpiresActive On
ExpiresByType image/jpg “access 1 year”
ExpiresByType image/jpeg “access 1 year”
ExpiresByType image/gif “access 1 year”
ExpiresByType image/png “access 1 year”
ExpiresByType text/css “access 1 month”
ExpiresByType application/pdf “access 1 month”
ExpiresByType application/x–javascript “access 1 month”
ExpiresByType application/javascript “access 1 month”
ExpiresByType application/x–shockwave–flash “access 1 month”
ExpiresByType image/x–icon “access 1 year”
ExpiresDefault “access 2 days”
</IfModule>
## LEVERAGE BROWSER CACHING ##
For me, it is necessary but you need to edit it to suit to your sites.