Browser caching is an important factor to load your website quickly. If you test your website using online speed test tools like Google PageSpeed, you will get a message stating that you should leverage browser caching for some static contents
Google Mobilegeddon is on its way
Couple of months ago, Google started to notify webmasters for mobile friendly website. If the website is not mobile friendly, they were notifying all users via Google Webmaster Tools. Google has Rolling out the mobile-friendly update to begin globally rolling