You have to tag you site using googles webmaster console!
Then setup all the predefined events & listeners... its very anying!
basically just open all of googles tools & link everything!
Analytics + tag Manager + Optimize + Data Studio
the integration code snippets are huge! My entires sites code isnt as long as the integrations...
The best & simples way of setting up G4A is to fuck it & go for clarity!
Bing Webmaster Tools & Clarity are the Microsoft equivalent!
