So you have a website (and if you don't you are losing clients because you are losing credibility, but that's another post). How well is your website doing? How many people are visiting it, how many stay, for how long, how many leave right away, how are people finding you? Want to know the answers? Check out Google Analytics.
Google Analytics is a powerful tool to analyze your website traffic. Understanding where your traffic is coming from and why as well as why people leave your site will help you improve your site and improve your ability to generate business with it.
Here is a great video introduction to Google Analytics. Remember, this is basics. You are getting the overview, there is even more power there to be had: