Google has been under fire lately for political bias, data breaches, service outages, aiding the China with censorship and surveillance (DragonFly), CEO dumping stocks, fire at Google's office in China minutes after hearing, list goes on... Not to mention Facebook, Twitter, etc. Until these big tech companies are regulated or go 100% open source (emphasis 100%) and decentralized, how can we trust how they handle our personal information? In the meantime, here's how to limit the information Google collects about you.
Warning: This will result non-targeted ads (the old fashion way :), no YouTube / Google search history, YouTube not highlighting which videos you've watched, YouTube not showing your watch progress on a video, and Google Maps GPS history to name a few. Proceed at your own discernment.
Personally, I got rid of everything except my YouTube comments and live chat history. :)
Pause all your Google Activity page. Tap all buttons on the right to turn off ("pause").