The same idea is worthwhile to apply to your vital online accounts, too—verifying that they’re secure. In that vein, a periodic review of devices logged into your Google account is a good idea.

If you need to log out of your Google account from a device you no longer have access to, you can do so remotely: Go to Your Devices Page: Navigate to the Google account devices page.

You can add multiple Google accounts on your Android device. However, it considers the first account you sign in with as the default and uses it to sign you in across various Google apps and services.