Get answers from a spreadsheet you're not sure how to read

Help me understand a spreadsheet.

The data: [paste it, or upload the file, removing names and personal details]
What the columns mean: [if not obvious]
The question I need to answer: [e.g. which region dropped, is it getting better]
Who it's for: [role]

Ask me up to 3 short questions first if anything important is missing. Wait for my answers.

Then:
1. The three main patterns, each with the figures that show it.
2. A 5-line summary for my manager.
3. One chart that would show it best, and how to make it.
4. Anything odd in the data (gaps, outliers, totals that don't add up).
5. Questions the data raises but can't answer.

Show your working. Only use what I've told you, leave blanks for anything I haven't given, and don't invent facts, dates or results. UK English.

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