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10 AI Prompts I Found on Reddit That Actually Work (Copy-Paste Ready)

#tutorial

I spent 3 weeks going through r/ChatGPT, r/ClaudeAI, and r/PromptEngineering collecting prompts that had 100+ upvotes and real proof they work.

Most "prompt lists" online are garbage. These aren't.

Here are the 10 that made it into my permanent collection.

1. The Step-by-Step Explainer 

Explain [CONCEPT] step by step from first principles.
After each step, check: "Is this clear before going deeper?"
End with a 3-sentence summary a 10-year-old could understand.
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Forces the AI to teach, not just dump information.

2. The Devil's Advocate 

I'm going to share a plan. Find everything wrong with it.
Be brutally honest. Poke holes in assumptions.
Plan: [YOUR PLAN]
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Best prompt for decision-making. Gets honest critique, not validation.

3. The Code Reviewer 

Review this code as a senior engineer doing PR review.
Flag: security issues (🔴), performance (🟡), style (🟢).
Be direct. Don't compliment. Just find what needs fixing.

[PASTE CODE]
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4. The Research Synthesizer 

After reading all these sources, identify:
(1) what they agree on
(2) what contradicts  
(3) what's missing
Don't summarize each — synthesize across all.

[PASTE SOURCES]
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5. The Rubber Duck Debug 

I'm going to explain a bug. Don't give solutions yet.
Ask clarifying questions until you fully understand the problem.
Then suggest fixes.
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Half the time you find the bug yourself while answering.

6. The Email Rewriter 

Rewrite this email to be [direct/warm/formal].
Keep every piece of information.
Cut word count by 30%.
Don't start with "I hope this email finds you well."

Original: [EMAIL]
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7. The Second Opinion 

You just gave me an answer. Now argue the opposite.
What's the strongest case against what you just said?
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Use immediately after any AI response you're about to act on.

8. The Meeting Prep 

Meeting with [PERSON] about [TOPIC] in [TIME].
My goal: [GOAL]
Give me: 3 questions to ask, 2 things to watch out for, 1 thing to prepare.
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9. The Learning Accelerator 

I want to learn [SKILL] in [TIMEFRAME]. Current level: [LEVEL].
Focus on 20% of concepts covering 80% of use cases.
Tell me what to skip and why.
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10. The Output Formatter 

Format this as [table/JSON/bullets/numbered steps].
No commentary. No preamble. Just the formatted output.

[DATA]
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"No preamble" is the key instruction that eliminates AI fluff.

Want the other 40?

I compiled 50 total — business strategy, creative work, power-user techniques.

👉 50 Battle-Tested AI Prompts — $7

Or grab the free 10-prompt PDF: Free download

What's your most-used prompt? Drop it in comments.

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