For most people, analytics is just about know how much traffic you're getting and where it's coming from and what they're doing on your site. For example, if 30% of the visitors from reddit.com convert to paying customers but 60% of users from indiehackers.com convert to paying customers you'll know to spend time, money, etc on indiehackers.com.

Also, my understanding is Google pretends like they don't really look at your traffic data and use that for search.