From the main support index at https://support.google.com/googleone/ here are various tidbits of useful content that the surrounding HN comments wished for (sorry, none describe the "expert help" available):
"Get Google One":
https://support.google.com/googleone/answer/9004013
> With Google One, you get more storage, help from experts, and extra member benefits. You can share your membership with up to 5 family members.
"How your existing storage works with Google One":
https://support.google.com/googleone/answer/9004014
> You'll get storage through your Google One membership, which will become your new storage limit. You'll no longer buy storage through Google Drive.
"Claim a Benefit":
https://support.google.com/googleone/answer/9003266
> Google One hotel deals depend on the day, time, and other factors. There might not be a deal for every hotel search.
https://support.google.com/googleone/answer/9080668
"Learn where Google One is available":
> Create or join a family; Use Google Play Family Library; Subscribe to the Google Play Music family plan; Use a family calendar