> You'll need to add more information. what does "track existing cookies" mean? Track where? What does "make them show" mean? Make them show...where?
Like, the moment a website loads - some cookies are stored, right? Well, I want to see what those are. In firefox I can use Tools > Web Developer > Storage Inspector to see them (_ga, _gid, etc). Now, in the guide I linked in the post it is explained that GTM allows me to prevent those cookies from being stored prior to user consent (as in when clicking on an "accept cookie policy" button), but that means GTM needs to detect those cookies first, right? For example look at this IMAGE taken from the guide. But the guide doesn't explain how to set up GTM to have those things be as shown in the image/guide. This is what I need to know.
​
> If you simply want to know what (first-party) cookies are written in the user's browser, you can create a JavaScript Variable for global variable name document.cookie. It will return a string that has all the cookie configurations that have been set in first-party context on the user's browser for the current domain.
There is nothing simple about this to me. I only just learned about Google Tag Manager and set it up like a few days ago. I don't understand what you're explaining to me at all. No idea what a javascript variable is and all that ... string? ... That's why a lot of guides I find by googling myself just can't help me, and that's why I'm here asking in plain for explanation.