It's very difficult to make improvements to your online business without knowing what to improve.
You need metrics.
How many visitors do you get each day?
Where do they come from?
Are they increasing, decreasing or staying around the same?
What proportion are using computers, tablets or smartphones to find your site?
Which pages are the most popular?
And so on.
Google Analytics is the free tool that gives you all this information and more.
But it's not trivial to set up.
This course leads you through the process step by step.