What Google Knows About You - Business Insider

Some useful tips for tracking what Google tracks about you

"Google uses a lot of methods to learn about you. There's the stuff you tell Google outright when you sign up for its services, like Gmail and Google Maps, or via an Android phone, like your name, phone number, location, and so on. Google also deduces information about you from watching your internet searches (what do you search for? click on?) and from the stuff you do with Google's products.

By visiting a site called "Ads Settings" you can see what Google knows about you."

What Google Knows About You - Business Insider