Campaign URL Builder is a very important and easy to use free tool from Google, which helps you to track exactly where your direct traffic is coming from. I'm sure that you will have seen it in use, as it adds a string of characters after your url showing various parameters.
An example would be - https://www.criticalmassmarketing.co.uk/?utm_source=Blog&utm_medium=Web_Site&utm_content=CMM
I use it for the url on the bottom of my emails, so that I can see if people have come through to my website from there.
But you can use it anywhere you are promoting your websites url. Think about how many times you write your url and you can then track each event. Click on the link below, to access the free tool which will create a uniquely trackable url for you.