What are Google Analytics best practices ? Share your experience

Unity Engine
1

Hello,
I am implementing Google Analytics on my game at the moment. I will track the different screens and levels but I would like some advices on what is important to track and how to set the tracking properly so that I can better exploit the data in the future. Here my main questions but feel free to come up with other relevant experiences as well.
Thanks

1. What event categories should be ?
I am thinking to have event based on “navigation”, “InGame”, "Social, “Purchase”
but should it be screens based like “home screen”,“Game”,“GameOver” ?
Or is there another relevant model I can use ?

2. How shall I structure of my GA event ?
here the example I have from the website : SendEventHit(“video”, “play”, “holiday”, 300);
for example SendEventHit(“navigation”, “pressplay”, “Level1”, 0) ?
What structure model shall I have ?

3. Any example of relevant data to track?
4. Anyone using Google FireBase ? Is it good for games ?
5. Is it worth adding a second tracking tool like Unity Analytics or Flurry

2

I recently studied this question. There is a lot of information about this on the Internet. If you also want to know more about this issue, read this article https://www.owox.com/blog/articles/custom-tags-in-gtm/. This is not a difficult question, but it requires study.