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Common Prompt Mistakes That Waste Your Time
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AI Tips 4 min readAugust 1, 2026

Common Prompt Mistakes That Waste Your Time

Many people write prompts the wrong way and get bad results. I made these mistakes too when I started. Here are the errors to avoid and how to fix them fast.

Rosa BernardoBy Rosa Bernardo

Why Bad Prompts Happen

When I started with AI, my prompts were bad. Very bad. I asked short questions and got useless answers. Then I blamed the AI.

But the problem was me. Not the tool.

Most people make the same small mistakes. These mistakes waste your time. You keep trying again and again. And you still get bad results.

In this post I share the mistakes I made. And how I fixed them. This is not about fancy tricks. This is about stop doing wrong things.

Mistake 1: Being Too Short

My first mistake was writing too little. I typed "write me email" and pressed enter.

The AI does not know what email. To who? About what? What tone?

So it gives a generic email. Boring and useless.

Now I add more words. I say who the email is for. I say the goal. I say short or long. This small change gives much better result.

More detail is not always better. But too little detail is always bad.

Mistake 2: Not Giving a Role

This one changed everything for me. I found that giving the AI a role helps a lot.

Instead of "explain marketing" I write "You are a marketing expert with 10 years experience. Explain marketing to a beginner."

The answer becomes deeper. More focused. The AI acts like the person you name.

Try this. It costs you nothing. But the difference is big.

Mistake 3: Asking Everything at Once

When I was new, I put too many tasks in one prompt. Write a blog, make titles, do SEO, add images ideas, translate to Spanish. All in one message.

The AI gets confused. It does some parts well and some parts bad.

Now I break big tasks into small steps. One task per prompt. Then I move to next step. The quality is much higher.

Small steps beat one giant prompt. Every time.

Mistake 4: No Examples

This is a very helpful tip. Show the AI what you want.

If you want a certain style, give an example of that style. If you want a list format, show a small sample list.

I call this "show, not just tell." The AI copies your example. So you get output that looks like what you imagine.

Without example, the AI guesses. And guesses are often wrong.

Mistake 5: Not Saying the Format

Sometimes I wanted a table. But I got a paragraph. My fault. I never said table.

Always tell the format you want. Some options:

  • A table with columns
  • A numbered list
  • Short bullet points
  • A single paragraph

When you say the format, you get the format. Simple.

Mistake 6: Giving Up Too Fast

Many people try one time. The result is bad. So they quit and say AI is useless.

But good prompting is a talk. Not one message.

I keep the chat going. I say "make it shorter." Or "more friendly tone." Or "remove the last part."

Each reply gets closer to what I want. The AI remembers the chat. Use this. Do not start over every time.

Mistake 7: Not Saying What You Don't Want

This took me long time to learn. Tell the AI what to avoid.

For example: "Do not use difficult words." Or "Do not write more than 100 words." Or "Avoid marketing buzzwords."

When you set limits, the AI stays inside them. This saves you many edits later.

A Simple Prompt Formula

Here is the simple structure I use now. It is easy to remember.

  • Role: who the AI should be
  • Task: what you want done
  • Context: background info the AI needs
  • Format: how the answer should look
  • Rules: what to avoid

You do not need all five every time. But even three of them make a big difference.

What I Learned

Good prompting is not magic. It is just clear thinking.

If you are confused about what you want, the AI is also confused. So first, know your goal. Then say it clearly.

In my experience, these small fixes save hours. I stop fighting with the AI. I start working with it.

Try to fix one mistake this week. Maybe start with adding a role. Or giving one example. Small change, big result.

You will feel the difference fast. And your prompts will get better every day.

Rosa Bernardo

Written by

Rosa Bernardo

Lisbon-based brand designer. AI is my brainstorming partner — I come to it with problems and leave with possibilities.

#prompt engineering#ai mistakes#prompt tips#beginner ai

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