Gemini · Module 06 of 6

Mistakes

The common errors that make Gemini output worse — and how to avoid them.

1 lesson1 exercise
Common Gemini mistakes

Treating Gemini like a text-only chatbot

The most common way to underuse Gemini is to ignore what makes it distinctive. People paste a short paragraph and describe a chart in words, when they could have shown Gemini the chart directly; they summarise a document before asking, when they could have handed over the whole thing. Both throw away Gemini's real strengths — long context and multimodal input. When you find yourself pre-digesting material before prompting, that is usually the mistake to catch.

The usual prompting traps still apply

Beyond the Gemini-specific errors, the universal ones hold: vague requests with no context, cramming several asks into one prompt, and trusting a fluent answer without checking it. Give context, a clear goal, and a format; break complex work into steps; and verify anything that matters against a source. Fluency is not accuracy in any assistant, Gemini included, so a light verification habit protects you from confident errors.

The mistake topics to explore

This section covers prompting mistakes — the traps, both Gemini-specific and universal, that waste your time. Each card below pairs a common error with its fix.

Frequently asked
What is the most common Gemini mistake?

Treating it like a text-only chatbot — describing charts in words or pre-summarising documents instead of showing Gemini the material directly. That throws away its long-context and multimodal strengths.

Does Gemini make mistakes or hallucinate?

Yes, like any assistant it can produce confident but wrong answers. Verify anything important against a source, and do not treat a fluent response as a checked one. A light verification habit catches most errors.

Why am I not getting good results from Gemini?

Often because prompts lack context or under-use its strengths. Give it the full material rather than a summary, show it images and files directly, state a clear goal, and it will perform far better.

Should I summarise documents before giving them to Gemini?

Usually not. Gemini's long context means it is often better to give it the whole document and a precise question, so no detail is lost in your summary. Let its context window do the reading.

Test yourself

Are you making these Gemini mistakes?

Three questions on the habit that caps most people's results — treating Gemini like a search box. No sign-up, instant score, and you can share how you did.

  1. Q1 What's wrong with typing 'best framework 2026' into Gemini?
  2. Q2 You judge Gemini on prompts you'd have typed into a search bar. What's the flaw?
  3. Q3 You omit your constraints from a recommendation request. What's the consequence?
0 / 3 answered