If you’d like to see how much information that Google is capturing on your online activities type this into your chrome browser
You will get this screen below.
While this says that only you can look at this information, in reality if you constantly stay logged-in, anyone with access to your computer can pull up this information.
You also have options to delete this information or stop it’s collection.
The video below from Padre of Know How, goes into some of the details.