1. Your real names

2. Your gender

3. Date of birth

4. Personal cell phone-numbers

5. Where you live

6. Your voice (when you use voice search)

7. Recent searches made on google

8. Your address ( when you sign-up for adsense)

9. Exactly where you have been the pass days, weeks, months and years.

10. Where you work or have worked

READ: https://www.outalks.com/google-alternatives/

Google however, does not keep this info/data on lock. Therefore its possible to be accessed by anyone who wish to know about you.

source: https://www.outalks.com/forums/topic/10-things-google-knows-about-you/