Google will ask you to go through several steps to secure your Google account and verify your information. You will need to confirm your account recovery information and connected devices. The tool will also show you what applications and services have access to your Google account (for me it was only Chrome and Target's Cartwheel app). Further, it will ask you to set up 2-factor authentication and confirm that you still want to leave the listed app passwords active (app passwords are randomly generated passwords used in apps that do not support 2-factor authentication, such as Thunderbird).
After stepping through the security checklist, you will find an addtional 2GB of storage space in your Drive account. Note that native Google Docs do not count against your space, but uploaded copies of things like Excel spreadsheets and Word documents kept in those formats do. Get the free space while it's still being offered!
Also, I hope that you have already locked in your OneDrive storage space as well!