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Common Mistakes

Prompt Mistakes

Most bad AI outputs trace back to one of six mistakes. Learn to spot them, diagnose them, and fix them — in any prompt you write.

6 min read 6 mistakes + fix formula Free
Section 1
The 6 most common mistakes

Every mistake here has the same root cause: the AI was given too little to work with. Each card shows what the mistake looks like and exactly how to fix it.

1
Being too vague
The most common mistake — and the easiest to fix

Vague prompts produce vague results. "Write something about marketing" gives the AI no direction — it can only guess what you want and will default to the most generic possible interpretation. One specific sentence transforms the output completely.

❌ Too vague
Write something about marketing
✓ Specific
Write 5 Instagram caption ideas for a coffee brand targeting remote workers aged 25–40
→ Fix: Add what you want, who it's for, and what format it should take.
2
No context
AI doesn't know your situation unless you tell it

The AI has no idea who you are, what your brand is, or why you need this output. A single sentence of background — your product, your industry, your goal — completely changes what it produces. Without context, it invents assumptions that may not match your reality.

❌ No context
Write a product description
✓ With context
Write a product description for a reusable water bottle sold to eco-conscious parents aged 30–45 who shop on Instagram
→ Fix: Add one sentence describing your product, brand, or situation before the main instruction.
3
No audience defined
Who reads it changes everything

The same topic written for a 12-year-old and written for a PhD researcher looks completely different. If you don't define the audience, the AI defaults to a generic "general adult reader" — which is usually nobody in particular. One sentence of audience definition changes vocabulary, complexity, examples, and tone simultaneously.

❌ No audience
Explain how compound interest works
✓ Audience defined
Explain how compound interest works to a 16-year-old who has never studied finance. Use a real-world analogy.
→ Fix: Add "for [describe reader]" — age, background, knowledge level, or role.
4
No format requested
Without structure, the AI invents one

Without a format instruction, the AI will structure the output however it sees fit — which may be 800 words when you wanted 5 bullet points, or a wall of prose when you needed a table. Specifying the format takes one extra sentence and saves multiple rounds of reformatting.

❌ No format
Give me ideas for a homepage
✓ Format defined
Give me 5 homepage headline ideas as a numbered list. One sentence each. No explanations.
→ Fix: Specify format — bullet points, table, numbered list, paragraph, email, step-by-step, under X words.
5
Asking too many things at once
Overloaded prompts produce diluted outputs

Stacking five different requests into one prompt forces the AI to split its attention. The result is usually shallow on all five rather than excellent on any one. When you have multiple distinct tasks, split them into separate prompts or use multi-step prompting where each step builds on the last.

❌ Overloaded
Write a blog post, social captions, email newsletter, FAQ, and a product description for my new app
✓ Focused
Write a 600-word blog post announcing my new app. Target: productivity professionals. Then I'll ask for the social captions separately.
→ Fix: One clear task per prompt. Use follow-up prompts for additional deliverables.
6
Never refining the output
Treating the first response as final

The best prompt writers don't try to write the perfect prompt upfront — they treat the first output as a draft and refine it through follow-up instructions. If the result is 70% right, it is faster and more effective to tell the AI what to fix than to rewrite the prompt from scratch and start over.

❌ Starting over
*Deletes everything, rewrites the whole prompt, gets similar result again*
✓ Refining
"Make it 30% shorter. Change the opening to be more direct. Add one concrete example in the third paragraph."
→ Fix: Accept 70% on the first try. Use specific follow-up instructions to fix the remaining 30%.
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Section 2
Bad prompt vs better prompt

Eight real examples showing exactly which mistake each bad prompt makes and what a single focused improvement looks like.

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❌ Bad prompt ✓ Better prompt Improvement made
Write better Rewrite this landing page headline for higher conversions. Give 5 options. Under 10 words each. Added specific goal + format + constraint
Explain SEO Explain SEO for beginners in 5 bullet points. Use plain language, no jargon. Added audience + format + language rule
Write an email Write a follow-up email to a prospect who hasn't replied in 5 days. Friendly tone, under 80 words, one clear CTA. Added use case + tone + length + goal
Give me ideas Give me 10 newsletter topic ideas for a personal finance audience aged 25–40. Focus on actionable money habits. Added quantity + audience + topic focus
Write a bio Write a 3-sentence professional bio for a UX designer with 5 years of experience. LinkedIn tone, third person. Added length + role + context + format
Summarise this Summarise the text below in 5 bullet points. Focus on key decisions and action items only. Ignore background context. Added format + focus area + exclusion rule
Make it better Rewrite this paragraph to be 40% shorter. Keep the main argument. Remove filler phrases and passive voice. Specific instruction replaces vague request
Help with my website Review the homepage copy below. Identify the 3 weakest sentences and suggest a specific rewrite for each. Turned broad ask into precise, executable task
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Section 3
The fix formula

Apply these four steps to any weak prompt. Each step eliminates one of the most common mistakes.

1
Clarify goal
What exactly do you want? Replace vague verbs with specific tasks.
2
Add context
Who is this for? What's the product, brand, or situation?
3
Set structure
What format, length, and tone do you want the output in?
4
Refine output
Use follow-up instructions to fix specific issues in the result.
💡
Quick test: Before sending any prompt, ask yourself — "Have I said what I want, who it's for, and how it should look?" If you can answer all three, the prompt is ready.
Section 4 — Interactive
Prompt self-diagnosis checklist

Before you send your next prompt, run through this list. Check off each item you've covered — the more boxes ticked, the stronger your prompt.

I have a clear, specific goal — not "write something" but "write [specific task]"
I have described the context — my product, brand, situation, or background
I have defined the audience — who will read or use this output
I have specified the format — bullet points, table, email, paragraph, word count
I am asking for one thing at a time — not five tasks in one prompt
I am ready to refine the result rather than expecting a perfect first draft
0 of 6 covered — check each item above
Section 5 — Try it now
A fully upgraded prompt

This prompt started as "explain SEO" — one of the weakest possible prompts. Here is what it looks like after applying all four steps of the fix formula.

Before — the bad prompt
Explain SEO
After — applying the fix formula
Act as a digital marketing educator.
Explain SEO for complete beginners who run small online businesses and have no technical background.
Format: 5 bullet points, each with a one-sentence explanation and one practical action the reader can take today.
Tone: clear, encouraging, and jargon-free.
End with a single sentence summarising why SEO matters for small businesses.
Step 1 — Goal: Explain SEO (specific topic)
Step 2 — Context: Small business owners, no tech background
Step 3 — Structure: 5 bullets, tone defined, clear ending
Step 4 — Ready to refine: Follow up if needed
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FAQ
FAQ
Usually because the request is too broad or unclear. The AI always tries to answer — it just fills the gaps in your prompt with assumptions. The more specific and structured your prompt, the less room there is for misinterpretation.
No. A short, specific prompt beats a long, vague one every time. Length only helps when it adds clarity — a 5-word prompt with a clear goal often outperforms a 200-word prompt that rambles. Add length only when each word contributes something the AI needs.
Being too vague. Prompts like "Write something about X" give the AI no direction. Adding a goal, audience, and format to any prompt immediately produces better output — even just one of those three makes a measurable difference.
If the AI output is generic, too long, off-topic, or misses the point — the prompt is the problem. Use the fix formula: clarify goal, add context, set structure, refine output. In almost every case, one of these four steps fixes the issue.
Rarely. It is faster to tell the AI exactly what to fix: "Make it shorter", "Change the tone to professional", "Add an example in the second paragraph". Iterating from a partial result almost always beats starting from scratch — the AI retains context from the first response.
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Next steps

Now that you know what to avoid — see proven examples and learn how to write better prompts from scratch.

📚 Tutorial overview 📋 35+ prompt examples 🎯 How to write better prompts

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