1. Head over to the Supabase website.
2. Click on "Start your project" and either sign up or log in if you already have an account.
3. Create a new project by filling in the necessary details like project name, organization, and region.
4. Once done, you'll be taken to the project dashboard.

1. In the Supabase project dashboard, go to the "API" section.
2. Jot down your API URL and API Key because you'll need them to connect Gatsby.js to your Supabase project.

1. Make sure you have Node.js installed on your computer.
2. If you haven't already, install the Gatsby CLI by running:
   ```bash
   npm install -g gatsby-cli
   ```
3. Create a new Gatsby.js project:
   ```bash
   gatsby new supabase-gatsby
   ```
4. Move into the project directory:
   ```bash
   cd supabase-gatsby
   ```

1. Install the Supabase JavaScript client in your Gatsby project:
   ```bash
   npm install @supabase/supabase-js
   ```

1. Create a new file in your Gatsby project directory, for example, src/utils/supabaseClient.js.

2. Inside supabaseClient.js, initialize the Supabase client using your credentials:
   ```javascript
   import { createClient } from '@supabase/supabase-js';

   const supabaseUrl = 'YOUR_SUPABASE_URL';
   const supabaseKey = 'YOUR_SUPABASE_KEY';

   export const supabase = createClient(supabaseUrl, supabaseKey);
   ```

1. Now, you can use the Supabase client in your Gatsby pages or components.

2. For example, to fetch data from a Supabase table and display it on a page:
   ```javascript
   // src/pages/index.js
   import React, { useEffect, useState } from 'react';
   import { supabase } from '../utils/supabaseClient';

   const IndexPage = () => {
   const [data, setData] = useState([]);

   useEffect(() => {
   const fetchData = async () => {
   const { data, error } = await supabase
   .from('your_table_name')
   .select('*');
   if (error) console.error('Error fetching data:', error);
   else setData(data);
   };
   
   fetchData();
   }, []);

   return (
   

   
   

   Supabase Data

   
   

   
   {data.map(item => (
   
   • {item.name}
   
   ))}
   

   
   
   
   );
   };

   export default IndexPage;
   ```

1. In the terminal, start the Gatsby development server:
   ```bash
   gatsby develop
   ```
2. Open the project in your browser at http://localhost:8000 to see the data fetched from Supabase displayed on your Gatsby page.

1. To deploy your Gatsby site, you can use services like Netlify, Vercel, or GitHub Pages.
2. Follow the respective service's deployment guide, making sure your Supabase credentials are securely stored in environment variables on the hosting platform.

This setup can be further customized based on different needs, such as handling authentication or real-time data updates, by utilizing Supabase's rich feature set within the Gatsby ecosystem.