ChatGPT is only as useful as the instructions you give it. A vague prompt produces a generic answer. A clear, well-structured prompt produces something genuinely useful. This guide explains the basics of writing good prompts — no prior experience needed.
What Is a Prompt?
A prompt is the instruction or question you type into ChatGPT. Every response you get is shaped by the prompt that preceded it. Learning to write better prompts is the single most effective way to get more value from AI tools — no subscription upgrade required.
The Four Elements of a Good Prompt
Most strong prompts include some or all of these four elements:
- Task — what you want ChatGPT to do (write, summarise, explain, compare, generate)
- Context — the relevant background information (who you are, what the situation is, what the purpose is)
- Format — how you want the output structured (bullet list, email, table, numbered steps)
- Constraints — any limitations (length, tone, things to include or avoid)
You do not need all four every time — a simple question is sometimes enough. But when you want high-quality output for something important, including all four produces noticeably better results.
Comparing Weak and Strong Prompts
Here are some examples showing the difference a well-structured prompt makes.
Writing an Email
Weak: “Write an email about a late delivery”
Strong: “Write a professional email to a trade customer explaining that their order has been delayed by 3 days due to a supplier issue. Apologise, give a revised delivery date of 2 April, and offer a small discount on their next order as goodwill. Keep it under 150 words. Professional but warm tone.”
Explaining a Concept
Weak: “What is two-factor authentication?”
Strong: “Explain two-factor authentication to someone who is not technical and has never heard the term before. Use an everyday analogy. Keep it under 80 words.”
Generating Ideas
Weak: “Give me some blog post ideas”
Strong: “Give me 10 blog post ideas for a UK IT support company targeting small businesses. The audience is non-technical business owners. Focus on topics that answer common questions rather than technical deep-dives. Format as a numbered list with a one-sentence description for each.”
Common Beginner Mistakes
Being Too Vague
The most common mistake. “Write something about cyber security” could produce anything from a 500-word blog post to a one-sentence definition. The more specific you are, the more useful the output.
Accepting the First Response Without Refining
ChatGPT is a conversation, not a one-shot tool. If the first response is close but not quite right, tell it what to change: “Make it shorter”, “The tone is too casual”, “Add a section on X.” Iterating usually produces better results than trying to write the perfect prompt first time.
Not Providing Context
ChatGPT does not know anything about you, your business, or your situation unless you tell it. Giving context (what your business does, who the audience is, what the purpose of the document is) consistently produces more relevant output.
Trusting Everything It Says
ChatGPT can produce confidently-stated incorrect information. Always verify facts, statistics, dates, and any claims that will be used in important documents or communications.
Useful Prompt Starters
Here are some reliable prompt structures that work well for common tasks:
- For writing: “Write a [format] for [audience] about [topic]. Tone: [tone]. Length: [length]. Include: [key points]. Do not include: [things to avoid].”
- For explaining: “Explain [concept] to [audience description]. Use [analogies/examples/plain English]. Keep it under [length].”
- For summarising: “Summarise the following [document/email/text] in [format — bullet points/one paragraph/three sentences]. Focus on [key aspects].” [paste text]
- For generating ideas: “Give me [number] ideas for [task/topic]. The context is [context]. Format as a numbered list with a brief description of each.”
Next Steps
The best way to improve at prompting is to practise. Pick one task you do regularly — writing emails, generating reports, researching topics — and try different prompt structures for a week. You will quickly develop a feel for what works and what does not.
