Advanced n8n: Sub-agents, Iterators, and Daily Reporting (Part 4)

If Part 1 was learning to walk, and Parts 2 & 3 were running... Part 4 is flying a fighter jet.

We have covered linear workflows (Trigger -> Action). But real business data is messy.

You don't just get one lead; you get a CSV with 5,000 leads.

You don't just want to send one email; you want to check the status of 500 orders and update them in Shopify.

You don't want to build the same "Error Handling" logic 50 times; you want to build it once and reuse it.

This is where the "Low Code" power of n8n truly separates itself from the "No Code" toys. Today we master Loops, Aggregation, and Sub-Workflows.

This is how we automate entire departments, not just tasks.