Each url you visit and each action you take in Chrome. There are variants of Chrome promising privacy, however.
What happens? Nothing has happened, so I don't know what you're talking about. They track the sites I visit? That doesn't really matter because they cannot advertise to me because I have ad blocker.
If being without privacy sounds fine to you, hell, Chrome is the best browser for you. Creating and selling user profiles is big business nowadays. They already know you better then you do.
I don't do anything on the computer that I would really care about. If they sell my information, then what good does it do if I have ad blocker installed??

I think you are worried needlessly . . . unless you have something you want to hide.
"I have nothing to hide" isn´t a proper argument. I am not worried in that way. The amount of data that they collect, be it Google, Apple, MS, or whatever, is that gigantic, that one disappears in the mass. But caution. Once somebody at Google searches for "ChrisL" your complete dossier appears and you may travel to a FEMA camp because you resisted online.