There are many different ways to get some stats regarding your site. One of the most popular solutions is to use Jetpack. Check this link for more info:
http://jetpack.me/support/wordpress-com-stats/
Alternatively you may use a plugin such as this one:
https://wordpress.org/plugins/wp-power-stats/
Another solution is to use a separate application such as AwStats which is usually provided by default on cPanel based Linux servers. Of course you may also integrate Google Analytics on your site. Here is a nice plugin for this purpose:
https://wordpress.org/plugins/google-analytics-for-wordpress/