The only way to know for sure how well your site is performing is to measure inbound traffic and the actions those visitors take.

Fortunately, you have a range of options; many of which are free.

JetPack

JetPack is a plugin for WordPress websites that includes traffic measuring and statistics services. If your website is WordPress based (an easy way to manage everything from one location) then JetPack can do almost everything you need.

Google Analytics

Google Analytics is a web statistics package. You will need to know how to add the code to all of your pages. This will have to be done manually for hand-coded pages or via a plugin, if you use a CMS (such as WordPress or Joomla).

Search Console

Regardless of which other stats package you use, Google Search Console will give you further insights including which search terms your site shows up for and how many times those searches resulted in clicks to your site.

You will have to wait a few days after registering for the numbers to start getting collected. Once they do, they can provide valuable insights.