N8N Google Sheets Workflow Automation

I want a ready-to-import n8n workflow that fully automates my Google Sheets tasks. The flow needs to:

• Read data from specific sheets and ranges
• Write new rows when triggered
• Update existing rows based on conditions I will share

Please build it with only standard n8n and the native Google Sheets node—no external scripts—so I can drop the JSON into my self-hosted instance and run it immediately. Clear inline node naming and a short note explaining how to set the necessary credentials will be very helpful.