+1 for NetGuard. I just started using it recently on a new phone and it was the first thing I installed before connecting the device to any network. You would be amazed how many apps try to make a connection to graph.facebook.com

Check out Exodus Privacy[1] to see what trackers are inside a certain app.

One could use F-Droid and Yalp Store[2] to try and have a bit more privacy on an Android phone and make it work without a Google account.

[1] https://exodus-privacy.eu.org/en/ [2] https://github.com/yeriomin/YalpStore

Too bad it works by creating a local VPN - I'm already using "Block This!" to block ads on my device which also works via a VPN, so you can't use both at the same time.