A hands-on starter workflow that teaches beginners how to:

Pull rows from a Google Sheet

Append a new record that mimics a form submission

Generate AI-powered text with GPT-4o based on a “Topic” column

Write the AI output back into the correct row using an update operation

Along the way you’ll learn the three essential Google Sheets operations in n8n (read → append → update), see how to pass sheet data into an OpenAI node, and document each step with sticky-note instructions—perfect for anyone taking their first steps in no-code automation.

0️⃣ Prerequisites

• Google Sheets

1. Open Google Cloud Console → create / select a project.
2. Enable Google Sheets API under APIs & Services.
3. Create an OAuth Desktop credential and connect it in n8n.
4. Share the spreadsheet with the Google account linked to the credential.

• OpenAI

1. Create a secret key at <https://platform.openai.com/account/api-keys>.
2. In n8n → Credentials → New → choose OpenAI API and paste the key.

• Sample sheet to copy (make your own copy and use its link) <https://docs.google.com/spreadsheets/d/15i9WIYpqc5lNd5T4VyM0RRptFPdi9doCbEEDn8QglN4/edit?usp=sharing>

1️⃣ Trigger Manual Trigger – lets you run on demand while learning. (Swap for a Schedule or Webhook once you automate.)

2️⃣ Read existing rows

• Node: Get Rows from Google Sheets
• Reads every row from Sheet1 of your copied file.

3️⃣ Generate a demo row

• Node: Generate 1 Row of Data (Set node)
• Pretends a form was submitted:
• Name, Email, Topic, Submitted = "Yes"

4️⃣ Append the new row

• Node: Append Data to Google
• Operation append → writes to the first empty line.

5️⃣ Create a description with GPT-4o

1. OpenAI Chat Model – uses your OpenAI credential.
2. Write description (AI Agent) – prompt = the Topic.
3. Structured Output Parser – forces JSON like: { "description": "…" }.

6️⃣ Update that same row

• Node: Update Sheets data
• Operation update.
• Matches on column Email to update the correct line.
• Writes the new Description cell returned by GPT-4o.

7️⃣ Why this matters

• Demonstrates the three core Google Sheets operations: read → append → update.
• Shows how to enrich sheet data with an AI step and push the result right back.
• Sticky Notes provide inline docs so anyone opening the workflow understands the flow instantly.

👤 Need help? Robert Breen – Automation Consultant ✉️ robert.j.breen@gmail.com 🔗 <https://www.linkedin.com/in/robert-breen-29429625/>