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How to check a spreadsheet with AI and whether the numbers hold
An AI can find an error in a table in seconds, but it can also miss one or invent one. How to write the instruction and what to verify yourself.
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AI in practice.
From a better prompt to a checked answer. Guides to return to long after the news moves on.
Earlier guides
| Date | Guide | Reading time |
|---|---|---|
| How to summarise a long document with AI and check what it left out A summary is useful until it leaves out exactly what you needed to know. How to write the instruction and check in a few minutes whether anything is missing. | 3 min | |
| AI can help you think, not just write How to use AI to examine a business idea, question assumptions and prepare customer interviews. A fictional home-cooked lunch delivery example. | 5 min | |
| Why do you keep explaining the same things to AI? Set up standing instructions and reference material for recurring work. Quick paths to ChatGPT and Claude Projects, Gemini Gems, and Copilot Notebooks. | 3 min | |
| NotebookLM is now Gemini Notebook. What can you do with it? How to turn PDFs, notes and other sources into useful overviews, comparisons or learning material. With a practical example and app demonstrations. | 5 min | |
| AI sounds convincing. How do you check if it is right? Check the source, conditions and consequences. | 4 min | |
| How to write a good prompt: tell AI what you actually need From a vague question to a useful answer. | 4 min | |
| The AI Act is already in force. What actually changed on 2 August? Transparency in business use of AI: emails, chatbots and publications. | 3 min | |
| What to tell AI and what to keep private Know which information to share and which to keep private. | 3 min |
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