You now understand dbt and the transformation layer.
What dbt does: Transforms data in-warehouse using SQL with dependencies, tests, and docs.
Materializations: View → Table → Incremental as complexity grows.
Testing: Built-in schema tests (unique, not_null, accepted_values).
Dependencies: Use source() for raw data, ref() for other models.
Best practices: Consistent naming, layered structure, test everything.
Next: Learn about cloud data warehouses.