Account recovery can be extremely valuable if you forget your Google password, but even more valuable if your account is hacked and you need to recover it. To get started with account recovery, navigate to Google.com/settings and proceed to sign-in to your account. From there, click the Security listing.
Under the Security page, select the option Account recovery options.
Google will then redirect you to the Account Recovery homepage, where you can add a phone number for recovery purposes or an alternative email address which can be used to verify an account, should it be compromised or hacked.
"Ways 1. Setup Account Recovery --Secure your Google Account"
Reference : online-tech-tips.com