GA/GTM – How to track “return visit” with cookies

I got asked by a client using GA/GTM to track return visits with an event. Here's how I did it. Step 1 If you don't already have an easy way to set/get cookies, get https://github.com/ScottHamper/Cookies script and add it to your custom javascript, or custom HTML enclosed in <script> tags. It's possible to do this [...]