[General Questions and Answers] comfortable:
Try MyAndroidTools to disable Google spyware embedded in apps. Components like these:

GcmInstanceIDListenerService GcmMessageListenerService

AppMeasurementService FirebaseInstanceIdService FirebaseMessagingService

AppMeasurementInstallReferrerReceiver AppMeasurementReceiver FirebaseInstanceIdInternalReceiver FirebaseInstanceIdReceiver

FirebaseInitProvider

These are all Google-related tracking/ analytics. Along with any Crashlytics components you see.

Stop using ALL Google apps. Including Chrome. Including bundled spyware. Including Play store. Including Calendar. Including SMS. Remove all of them from your rooted device and install non-Google equivalents. Try Osmand and others for maps and other apps from f-droid to get the functionality you want. Yes, it takes time.

Find app to change hostnames and Mac addresses and clean persistent cookies if you want. Find websites such as https://apps.evozi.com/apk-downloader/ to download some apps you can't get from f-droid.org. Some apps rely on Google Play being installed. In my experience, none of them are worth it. If your app requires them and you can't live without it, probably forget any decent privacy.

If using a Mozilla-based browser, add these to your block list in Adaway:

accounts.firefox.com

blocklist.addons.mozilla.org

blocklist.settings.services.mozilla.com

detectportal.firefox.co

dynamicua.cdn.mozilla.net

fhr.cdn.mozilla.net

firefox.settings.services.mozilla.com

incoming.telemetry.mozilla.org

input.mozilla.org

install.mozilla.org

location.services.mozilla.com

mozorg.cdn.mozilla.net

mz.la

search.services.mozilla.com

shavar.services.mozilla.com

snippets.cdn.mozilla.net

tracking-protection.cdn.mozilla.net

updates.push.services.mozilla.com

versioncheck-bg.addons.mozilla.org

webextensions.settings.services.mozilla.com

...to help stop browser spyware.

Download apps from f-droid. Use a good firewall. Use AdAway. Customise your blocklist in AdAway. Disable all auto update components unless you trust the CIA and NSA to 'take care' of your device.

Etc.

https://www.zerohedge.com/news/2017-08-28/how-cia-made-google

You may wish to consider blocking these Google domains if you are adamant you want no business with Google:

adservice.google.com

adservice.google.com.au

ajax.googleapis.com

apis.google.com

books.google.com

books.google.com.au

clients1.google.com

clients2.google.com

clients3.google.com

chart.googleapis.com

crashlytics.com

cse.google.com

console.firebase.google.com

encrypted-tbn0.gstatic.com

firebase.google.com

fonts.googleapis.com

fonts.gstatic.com

ggpht.com

googleanalytics.com

id.google.com.au

imasdk.googleapis.com

lh3.ggpht.com

lh4.ggpht.com

lh5.ggpht.com

lh6.ggpht.com

mail.google.com

maps.googleapis.com

ota.googlezip.net

payments.google.com

safebrowsing-cache.google.com

safebrowsing.google.comsb-ssl.google.com

ssl.gstatic.com

support.google.com

www.googleapis.com

www.googlecommerce.com

You can add more if you are really enthusiastic.

Many are safe to add to your AdAway block list, but some of these will annoy you on some websites or apps that use Google infrastructure, so be warned. You can always temporarily disable AdAway ad-blocking or identify the domain you want to remove from the blocklist by using the Log DNS Requests feature.