1. Head over to Supabase and log in.
2. Click on "New Project" to start a new one.
3. Fill in the details like Project Name, Database Password, and Region, then hit "Create new project".

1. In your Supabase project dashboard, go to the "Auth" section.
2. Click on the "Providers" tab.
3. Find "Google" in the list of OAuth providers and flip the "Enable" toggle.

1. Go to the Google Cloud Console.
2. Create a new project if you don't have one already.
3. Navigate to the "API & Services" section, then go to "Credentials".
4. Click the "Create Credentials" button and choose "OAuth client ID".
5. If you haven't already, configure your OAuth consent screen.
6. Set the application type to "Web application".
7. Configure your OAuth credentials with these settings:

• Authorized JavaScript origins: Add your Supabase project URL (e.g., https://[your-project-ref].supabase.co).
• Authorized redirect URIs: Add https://[your-project-ref].supabase.co/auth/v1/callback.

1. After creating the OAuth credentials, you'll see your Client ID and Client Secret.
2. Copy both values for the next step.

1. Go back to your Supabase project dashboard.
2. In the "Auth" section under the "Providers" tab, find Google again.
3. Paste the Client ID and Client Secret you copied from the Google Cloud Console.
4. Click "Save" to store your settings.

1. Go to the "Authentication" section in your Supabase dashboard.
2. Click "User Management" to see the users list.
3. Visit your Supabase project URL and try to sign in with Google.
4. Check that the Google sign-in works and that new users show up in Supabase under "User Management".

1. Use the Supabase JavaScript client to start Google OAuth login.

2. In your frontend script, set up Supabase with your project URL and public API key:
   ```javascript
   import { createClient } from '@supabase/supabase-js';

   const supabaseUrl = 'https://[your-project-ref].supabase.co';
   const supabaseKey = 'your-anon-public-key';
   const supabase = createClient(supabaseUrl, supabaseKey);
   ```

3. Implement the login function:
   ```javascript
   const { user, session, error } = await supabase.auth.signIn({
   provider: 'google'
   });
   ```

4. Handle the authentication response and redirect users accordingly.

And there you have it! Your Supabase authentication with Google OAuth should be all set up and ready to go.