Hi @Mr Edge , welcome to Azure! I'll try to answer any questions you have here, but feel free to ask more if you have any or I miss something.
First, are you using Visual Studio or Visual Studio Code? I recommend Visual Studio Code. You can follow the setup document here to integrate it.
To allow a user to sign-up you need to create a sign-up/sign-in flow. This is using Azure B2C, which you may be unfamiliar with. B2C stands for "business-to-consumer."
"Azure Active Directory B2C provides business-to-customer identity as a service. Your customers use their preferred social, enterprise, or local account identities to get single sign-on access to your applications and APIs."
Using this you can have users create account and sign in using your domain name such as "yourtenant@onmicrosoft.com." However, you want a Google login but you have to configure it first. You can do this by adding Google as an identity provider.
Everything else you need should be covered in those documents I listed. Let me know what questions you have after reading those or if I missed anything/need to elaborate!
If this answer helped you please mark it as "Verified" so other users can reference it.
Thank you,
James