Template: 'I have Excel 365. Columns: A Date, B Region, C Customer, D Amount. Rows 2-500. I want [goal]. Give the formula for cell F2 and explain it in 2 lines.'
Try: (1) total of North in September, (2) top 3 customers by amount, (3) flag duplicates of Customer+Date.
Test each formula on 3 rows where you know the answer.