Whilst many businesses understand that their analytics can provide them with invaluable data, few use the features of their analytics packages to full effect.
Once you have installed the necessary tracking code on each page of your website, then there are multiple options which you can configure to make the most of the data available. For instance, you can set conversion goals to check whether your visitors are performing the tasks that a) you expect them to and b) without abandoning processes part way through. This will allow you to rethink your strategy if visitors are not completing goals, and check that all your processes are working correctly for the users.
E-commerce tracking is a little more complicated, particularly if you have multiple products. In Google Analytics you will need to activate e-commerce tracking within your Google account, and then place specific code for each product on your site. Full details of this and an example are given within the Google Analytics Help pages.
So, check you are gathering the data that your analytics package makes available to you, and then monitor how your website is performing. If required, seek the help of web analytics consultants. As ever, it is by monitoring, measuring, and adapting that you will benefit the most from your own data.